MGT 4300 - BUS 3265 Questions
54. All processes will have what type of variation? a) Random b) Assignable c) Identifiable d) Stochastic e) Common
a) Random
55. What measures the central tendency of a set of data? a) Coefficient of variation b) Variance c) Standard deviation d) Mean e) Range
d) Mean
96. For the scores shown in the following stem and leaf display, what is the lowest score in the distribution? 9 374 8 945 7 7042 6 68 5 14 a. 7 b. 15 c. 50 d. 51
d. 51
91. What is the value of Σ(X - 2) for the following scores: 6, 2, 4, 2? a. 12 b. 10 c. 8 d. 6
d. 6
30. What type of probability distribution will most likely be used to analyze warranty repair needs on new cars in the following problem? The service manager for a new automobile dealership reviewed dealership records of the past 20 sales of new cars to determine the number of warranty repairs he will be called on to perform in the next 90 days. Corporate reports indicate that the probability any one of their new cars needs a warranty repair in the first 90 days is 0.05. The manager assumes that calls for warranty repair are independent of one another and is interested in predicting the number of warranty repairs he will be called on to perform in the next 90 days for this batch of 20 new cars sold. A) binomial distribution B) Poisson distribution C) Hypergeometric distribution D) None of the above
A) binomial distribution
13. The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. Relative Time (in Minutes) Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 What is the width of each class? A) 1 minute B) 5 minutes c) 2% d) 100%
B) 5 minutes
52. When testing for independence in a contingency table with 3 rows and 4 columns, there are degrees of freedom. A) 5 B) 6 C) 7 D) 12
B) 6
24. A selection of raffle tickets from a large bowl is an example of A) simple probability B) sampling without replacement C) subjective probability D) None of the above
B) sampling without replacement
58. Which of the following would imply that data observations are closely clustered around the mean? a) Small range and small standard deviation b) Small range and large standard deviation c) Large range and small standard deviation d) Large range and large standard deviation e) Neither range nor standard deviation has anything to do with "clustering."
a) Small range and small standard deviation
32. Sampling distributions describe the distribution of a) parameters b) statistics c) both parameters and statistics d) neither parameters nor statistics
b) statistics
20. In a right-skewed distribution a) the median equals the arithmetic mean b) the median is less than the arithmetic mean c) the median is greater than the arithmetic mean d) none of the above
b) the median is less than the arithmetic mean
50. The test for the equality of two population variances is based on a) the difference between the 2 sample variances. b) the ratio of the 2 sample variances. c) the difference between the 2 population variances. d) the difference between the sample variances divided by the difference between the sample means.
b) the ratio of the 2 sample variances.
68. How many scores in the distribution are used to compute the range? a. only 1 b. 2 c. 50% of them d. all of the scores
b. 2
74. A vertical line is drawn through a normal distribution at z = -1.00. How much of the distribution is located between the line and the mean? a. 15.87% b. 34.13% c. 84.13% d. -15.87%
b. 34.13%
92. What is the first step in the calculation of (ΣX)^2? a. Square each score. b. Add the scores. c. Subtract 2 points from each score. d. Add the X - 2 values.
b. Add the scores.
14. The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. Relative Time (in Minutes) Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 If 1,000 calls were randomly sampled, how many calls lasted under 10 minutes? a) 220 b) 370 c) 410 d) 590
d) 590
29. Thirty-six of the staff of 80 teachers at a local intermediate school are certified in Cardio- Pulmonary Resuscitation (CPR). In 180 days of school, about how many days can we expect that the teacher on bus duty will likely be certified in CPR? a) 5 days b) 45 days c) 65 days d) 81 days
d) 81 days
61. Assuming that data exhibit a normal distribution, control limits set at ± 3 standard deviations from the mean capture how much common variation? a) 50.00% b) 80.00% c) 95.44% d) 99.74% e) 99.99%
d) 99.74%
23 In a perfectly symmetrical bell-shaped "normal" distribution a. the arithmetic mean equals the median b. the median equals the mode c. the arithmetic mean equals the mode d) All the above
d) All the above
17. Which of the following statistics is not a measure of central tendency? a) Arithmetic mean b) Median c) Mode d) Q3
d) Q3
47. A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.90, a random sample of 100 doctors was selected. Suppose you reject the null hypothesis. What conclusion can you reach? A) There is not sufficient evidence that the proportion of doctors who recommend aspirin is not less than 0.90. B) There is sufficient evidence that the proportion of doctors who recommend aspirin is not less than 0.90. C) There is not sufficient evidence that the proportion of doctors who recommend aspirin is less than 0.90. D) There is sufficient evidence that the proportion of doctors who recommend aspirin is less than 0.90.
D) There is sufficient evidence that the proportion of doctors who recommend aspirin is less than 0.90.
56. What measures the difference between the largest and smallest observations in a set of data? a) Range b) Coefficient of variation c) Coefficient of kurtosis d) Coefficient of skewness e) Standard deviation
a) Range
9. A study is under way in Yosemite National Forest to determine the adult height of American pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American pines. The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results. Identify the sample in the study. a) The 250 randomly selected adult American pine trees b) The 25,000 adult American pine trees in the forest c) All the adult American pine trees taller than 60 feet d) All American pine trees, of any age, in the forest
a) The 250 randomly selected adult American pine trees
40. Which of the following would be an appropriate alternative hypothesis? a) The population proportion is less than 0.65 b) The sample proportion is less than 0.65 c) The population proportion is not less than 0.65 d) The sample proportion is not less than 0.65
a) The population proportion is less than 0.65
62. What is the term for the probability that a value falling outside the control limits is still due to normal variation? a) Type I error b) Type II error c) Normalization anomaly d) Beta risk e) Standard deviation irregularity
a) Type I error
46. An entrepreneur is considering the purchase of a coin-operated laundry. The current owner claims that over the past 5 years, the mean daily revenue was $675 with a population standard deviation of $75. A sample of 30 days reveals a daily mean revenue of $625. If you were to test the null hypothesis that the daily mean revenue was $675, which test would you use? a) Z-test of a population mean b) Z-test of a population proportion c) t-test of population mean d) t-test of a population proportion
a) Z-test of a population mean
5. The chancellor of a major university was concerned about alcohol abuse on campus and wanted to find out the proportion of students at the university who visited campus bars on the weekend before the final exam week. A random sample of 250 students was taken. The answer on "whether you visited campus bars on the weekend before the final exam week" from students in the sample is an example of. a) a categorical variable b) a discrete variable c) a continuous variable d) a table of random numbers
a) a categorical variable
6. The portion of the universe that has been selected for analysis is called a) a sample b) a frame c) a primary data source d) a secondary data source
a) a sample
26. If event A and event B cannot occur at the same time, then events A and B are said to be a) mutually exclusive b) independent c) collectively exhaustive d) None of the above
a) mutually exclusive
51. In testing a hypothesis using the c 2 test, the theoretical frequencies are based on the a) null hypothesis b) alternative hypothesis c) normal distribution d) None of the above
a) null hypothesis
34. If the expected value of a sample statistic is equal to the parameter it is estimating, then we call that sample statistic a) unbiased b) minimum variance c) biased d) random
a) unbiased
41. A Type I error is committed when a) you reject a null hypothesis that is true b) you don't reject a null hypothesis that is true c) you reject a null hypothesis that is false d) you don't reject a null hypothesis that is false
a) you reject a null hypothesis that is true
73. For a population with μ = 100 and σ = 20, what is the z-score corresponding to X = 105? a. +0.25 b. +0.50 c. +4.00 d. +5.00
a. +0.25
67. What is the variance for the following set of scores? 2, 2, 2, 2, 2 a. 0 b. 2 c. 4 d. 5
a. 0
22. Which of the following statements about the median is not true? a. It is more affected by extreme values than the arithmetic mean b. It is a measure of central tendency c. It is equal to Q2 d. It is equal to the mode in bell-shaped "normal" distributions.
a. It is more affected by extreme values than the arithmetic mean
90. The teacher in a communications class asks students to identify their favorite reality television show. The different television shows make up what scale of measurement? a. Nominal b. Ordinal c. Interval d. Ratio
a. Nominal
77. How does increasing the sample size influence the likelihood of rejecting the null hypothesis and the power of the hypothesis test? a. The likelihood of rejecting H0 and the power of the test both increase. b. The likelihood of rejecting H0 and the power of the test both decrease. c. The likelihood of rejecting H0 increases but the power of the test is unchanged. d. The likelihood of rejecting H0 decreases but the power of the test is unchanged.
a. The likelihood of rejecting H0 and the power of the test both increase.
12. Which of the following is most likely a parameter as opposed to a statistic? a) The average score of the first five students completing an assignment. b) The proportion of females registered to vote in a county. c) The average height of people randomly selected from a database. d) The proportion of trucks stopped yesterday that were cited for bad brakes.
b) The proportion of females registered to vote in a county.
76. A research report summarizes the results of the hypothesis test by stating, "z = 2.13, p < .05." Which of the following is a correct interpretation of this report? a. The null hypothesis was rejected and the probability of a Type I error is less than .05. b. The null hypothesis was rejected and the probability of a Type II error is less than .05. c. The null hypothesis was not rejected and the probability of a Type I error is less than .05. d. The null hypothesis was not rejected and the probability of a Type II error is less than .05.
a. The null hypothesis was rejected and the probability of a Type I error is less than .05.
75. If all the possible random samples of size n = 25 are selected from a population with μ = 80 and σ = 10 and the mean is computed for each sample, then what shape is expected for the distribution of sample means? a. The sample means tend to form a normal-shaped distribution with the peak around the population mean of 80. b. The sample means should center around the population mean in an unpredictable shape. c. The sample means tend to be distributed evenly across the scale, forming a rectangular-shaped distribution. d. There are thousands of possible samples and it is impossible to predict the shape of the distribution.
a. The sample means tend to form a normal-shaped distribution with the peak around the population mean of 80.
79. How does the shape of the t distribution compare to a normal distribution? a. The t distribution is flatter and more spread out, especially when n is small. b. The t distribution is flatter and more spread out, especially when n is large. c. The t distribution is taller and less spread out, especially when n is small. d. The t distribution is taller and less spread out, especially when n is small.
a. The t distribution is flatter and more spread out, especially when n is small.
94. A group of quiz scores ranging from 4-9 are shown in a histogram. If the bars in the histogram gradually increase in height from left to right, what can you conclude about the set of quiz scores? a. There are more high scores than there are low scores. b. There are more low scores than there are high scores. c. The height of the bars always increases as the scores increase. d. None of the above
a. There are more high scores than there are low scores.
82. ANOVA is necessary to evaluate mean differences among three or more treatments, in order to ____________________ . a. minimize risk of Type I error b. maximize risk of Type I error c. minimize risk of Type II error d. maximize risk of Type II error
a. minimize risk of Type I error
72. Of the following z-score values, which one represents the location closest to the mean? a. z = +0.50 b. z = +1.00 c. z = −1.00 d. z = −2.00
a. z = +0.50
35. Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in a certain year in the past. Suppose a sample of 100 major league players was taken. What was the standard error for the sample mean salary? a) $0.012 million b) $0.12 million c) $12 million d) $1,200.0 million
b) $0.12 million
28. The employees of a company were surveyed on questions regarding their educational background (college degree or no college degree) and marital status (single or married). Of the 600 employees, 400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the company is married and has a college degree is: a) 0.0667 b) 0.567 c) 0.667 d) 0.833
b) 0.567
48. If we are testing for the difference between the means of 2 independent populations presuming equal variances with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to a) 39 b) 38 c) 19 d) 18
b) 38
31. The owner of a fish market determined that the mean weight for a catfish is 3.2 pounds with a standard deviation of 0.8 pound. A citation catfish should be one of the top 2% in weight. A z-score of 2.054 for the top 2% was calculated. Assuming the weights of catfish are normally distributed, at what weight (in pounds) should the citation designation be established? a) 1.56 pounds b) 4.84 pounds c) 5.20 pounds d) 7.36 pounds
b) 4.84 pounds
43. How many tissues should the Kimberly Clark Corporation package of Kleenex contain? Researchers determined that 60 tissues is the mean number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X = 52, S = 22. Give the null and alternative hypotheses to determine if the number of tissues used during a cold is less than 60. a) H0 : µ ≤ 60 and H1 : µ > 60 b) H0 : µ ≥ 60 and H1 : µ < 60. c) H0 : X ≥ 60 and H1 : X < 60 d) H0 : X = 52 and H1 : X ≠ 52
b) H0 : µ ≥ 60 and H1 : µ < 60.
49. The Wall Street Journal recently published an article indicating differences in perception of sexual harassment on the job between men and women. The article claimed that women perceived the problem to be much more prevalent than did men. One question asked of both men and women was: "Do you think sexual harassment is a major problem in the American workplace?" 24% of the men compared to 62% of the women responded "Yes." Assuming W designates women's responses and M designates men's, what hypothesis should The Wall Street Journal test in order to show that its claim is true? a) H0: πw - πm ≥ 0 versus H1: πw - πm < 0 b) H0: πw - πm ≤ 0 versus H1: πw - πm > 0 c) H0: πw - πm = 0 versus H1: πw - πm ≠ 0 d) H0: πw - πm ≠ 0 versus H1: πw - πm = 0
b) H0: πw - πm ≤ 0 versus H1: πw - πm > 0
57. What measures symmetry of a distribution? a) Range b) Skewness c) Standard deviation d) Mean e) Variance
b) Skewness
8. A study is underway in Yosemite National Forest to determine the adult height of American pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American pines. The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results. Identify the population from which the study was sampled. a) The 250 randomly selected adult American pine trees b) The 25,000 adult American pine trees in the forest c) All the adult American pine trees taller than 60 feet d) All American pine trees, of any age, in the forest
b) The 25,000 adult American pine trees in the forest
19. Which of the arithmetic mean, median, mode, and geometric mean are resistant measures of central tendency? a) The arithmetic mean and median only b) The median and mode only c) The mode and geometric mean only d) The arithmetic mean and mode only
b) The median and mode only
3. To monitor campus security, the campus police office is taking a survey of the number of students in a parking lot each 30 minutes of a 24-hour period with the goal of determining when patrols of the lot would serve the most students. If X is the number of students in the lot each period of time, then X is an example of a) a categorical variable b) a discrete variable c) a continuous variable d) a statistic
b) a discrete variable
37. The standard error of the population proportion will become larger a) as population proportion approaches 0 b) as population proportion approaches 0.50 c) as population proportion approaches 1.00 d) as the sample size increases
b) as population proportion approaches 0.50
36. The standard error of the mean for a sample of 100 is 30. In order to cut the standard error of the mean to 15, we would a) increase the sample size to 200 b) increase the sample size to 400 c) decrease the sample size to 50 d) decrease the sample to 25
b) increase the sample size to 400
25. If the outcome of event A is not affected by event B, then events A and B are said to be a) mutually exclusive b) independent c) collectively exhaustive d) None of the above
b) independent
80. Which set of factors would produce the narrowest confidence interval for estimating a population mean? a. A large sample and a large percentage of confidence b. A large sample and a small percentage of confidence c. A small sample and a large percentage of confidence d. A small sample and a small percentage of confidence
b. A large sample and a small percentage of confidence
70. A teacher gave a reading test to a class of 5th-grade students and computed the mean, median, and mode for the test scores. Which of the following statements cannot be an accurate description of the scores? a. The majority of the students had scores above the mean. b. The majority of the students had scores above the median. c. The majority of the students had scores above the mode. d. All of the other options are false statements.
b. The majority of the students had scores above the median.
78. Which of the following is a fundamental difference between the t statistic and a z-score? a. The t statistic uses the sample mean in place of the population mean. b. The t statistic uses the sample variance in place of the population variance. c. The t statistic computes the standard error by dividing the standard deviation by n - 1 instead of dividing by n. d. All of the above are differences between t and z.
b. The t statistic uses the sample variance in place of the population variance.
69. A distribution is positively skewed. Which is the most probable order for the three measures of central tendency? a. mean = 40, median = 50, mode = 60 b. mean = 60, median = 50, mode = 40 c. mean = 40, median = 60, mode = 50 d. mean = 50, median = 50, mode = 50
b. mean = 60, median = 50, mode = 40
85. The data for a chi-square test for goodness of fit are called _________. a. observed proportions b. observed frequencies c. expected proportions d. expected frequencies
b. observed frequencies
95. A set of scores is presented in a frequency distribution histogram. If the histogram shows a series of bars that tend to decrease in height from left to right, then what is the shape of the distribution? a. Symmetrical b. positively skewed c. negatively skewed d. normal
b. positively skewed
86. The chi-square distribution is ______. a. symmetrical with a mean of zero b. positively skewed with all values greater than or equal to zero c. negatively skewed with all values greater than or equal to zero d. symmetrical with a mean equal to n - 1
b. positively skewed with all values greater than or equal to zero
88. A researcher is interested in the sleeping habits of American college students. A group of 50 students is interviewed and the researcher finds that these students sleep an average of 6.7 hours per day. For this study, the average of 6.7 hours is an example of a(n) a. parameter b. statistic c. population d. sample
b. statistic
66. Standard deviation is probably the most commonly used value to describe and measure variability. Which of the following accurately describes the concept of standard deviation? a. the average distance between one score and another b. the average distance between a score and the mean c. the total distance from the smallest score to the largest score d. one half of the total distance from the smallest score to the largest score
b. the average distance between a score and the mean
15. The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. Relative Time (in Minutes) Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 If 100 calls were randomly sampled, how many calls lasted 15 minutes or longer? a) 10 b) 14 c) 26 d) 74
c) 26
16. You have collected data on the monthly seasonally adjusted civilian unemployment rate for the United States over a 10-year period. Which of the following is the best for presenting the data? a) A contingency table b) A stem-and-leaf display c) A time-series plot d) A side-by-side bar chart
c) A time-series plot
10. Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $600 per semester. Identify the population of interest to the researcher. a) All Drummand University students b) All college students c) All first-year Drummand University students d) The 250 students that were monitored
c) All first-year Drummand University students
18. Which measure of central tendency can be used for both numerical and categorical variables? a) Arithmetic mean b) Median c) Mode d) Geometric mean
c) Mode
2. Which of the following is a continuous quantitative (numerical) variable? a) The color of a student's eyes b) The number of employees of an insurance company c) The amount of milk in a 2-liter carton. d) The number of gallons of milk sold at the local grocery store yesterday
c) The amount of milk in a 2-liter carton.
21. Which of the following is sensitive to extreme values? a) The median b) The interquartile range c) The arithmetic mean d) The 1st quartile
c) The arithmetic mean
39. Which of the following would be an appropriate alternative hypothesis? a) The mean of a population is equal to 55 b) The mean of a sample is equal to 55 c) The mean of a population is greater than 55 d) The mean of a sample is greater than 55
c) The mean of a population is greater than 55
38. Which of the following would be an appropriate null hypothesis? a) The population proportion is less than 0.65 b) The sample proportion is less than 0.65 c) The population proportion is not less than 0.65 d) The sample proportion is no less than 0.65
c) The population proportion is not less than 0.65
4. Researchers are concerned that the weight of the average American school child is increasing implying, among other things, that children's clothing should be manufactured and marketed in larger sizes. If X is the weight of school children sampled in a nationwide study, then X is an example of a) a categorical variable b) a discrete variable c) a continuous variable d) a table of random numbers
c) a continuous variable
27. If either event A or event B must occur, then events A and B are said to be a) mutually exclusive b) independent c) collectively exhaustive d) None of the above
c) collectively exhaustive
45. A ____________ is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis. a) significance level b) critical value c) test statistic d) parameter
c) test statistic
89. In a correlational study, how many variables are measured for each individual and how many groups of scores are obtained? a. 1 variable and 1 group b. 1 variable and 2 groups c. 2 variables and 1 group d. 2 variables and 2 groups
c. 2 variables and 1 group
81. The results of a hypothesis test are reported as follows: "t(20) = 2.70, p , .05." Based on this report, how many individuals were in the sample? a. 19 b. 20 c. 21 d. cannot be determined from the information provided
c. 21
93. In a grouped frequency distribution one interval is listed as 20-24. Assuming that the scores are measuring a continuous variable, what is the width of this interval? a. 3 points b. 4 points c. 5 points d. 44 points
c. 5 points
97. What is the median for the following set of scores: Scores: 3, 4, 6, 8, 9, 10, 11 a. 7 b. 7.5 c. 8 d. 8.5
c. 8
64. What is meant by a biased statistic? a. The average value for the statistic overestimates the corresponding population parameter. b. The average value for the statistic underestimates the corresponding population parameter. c. The average value for the statistic either overestimates or underestimates the corresponding population parameter. d. The average value for the statistic is exactly equal to the corresponding population parameter.
c. The average value for the statistic either overestimates or underestimates the corresponding population parameter.
87. Which of the following is not an example of binomial data? Classifying college students according to a. gender: male, female b. age: 21 or younger, older than 21 c. college class: freshman, sophomore, junior, senior d. registered voter: yes, no
c. college class: freshman, sophomore, junior, senior
63. A population has a mean of μ = 35 and a standard deviation of σ = 5. After 3 points are added to every score in the population, what are the new values for the mean and standard deviation? a. μ = 35 and σ = 5 b. μ = 35 and σ = 8 c. μ = 38 and σ = 5 d. μ = 38 and σ = 8
c. μ = 38 and σ = 5
60. Upper and lower control limits are usually set at ± how many standard deviations from the mean? a) 0.5 b) 1.0 c) 2.0 d) 3.0 e) 6.0
d) 3.0
33. The standard error of the mean a) is never larger than the standard deviation of the population. b) decreases as the sample size increases. c) measures the variability of the mean from sample to sample. d) All of the above.
d) All of the above.
11. Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $600 per semester. Identify the sample in the study. a) All Drummand University students. b) All college students. c) All first-year Drummand University students. d) The 250 students that were monitored.
d) The 250 students that were monitored.
1. Which of the following is a discrete quantitative (numerical) variable? a) The Dow Jones Industrial average b) The volume of water released from a dam c) The distance you drove yesterday. d) The number of employees of an insurance company
d) The number of employees of an insurance company
44. Which of the following statements is not true about the level of significance in a hypothesis test? a) The larger the level of significance, the more likely you are to reject the null hypothesis. b) The level of significance is the maximum risk we are willing to accept in making a Type I error. c) The significance level is also called the level. d) The significance level is another name for Type II error.
d) The significance level is another name for Type II error.
53.Which of the following is not associated with descriptive statistics? a) mean b) standard deviation c) range d) proportion e) measure of the distribution of data
d) proportion
7. Which of the following is most likely a population as opposed to a sample? a) respondents to a newspaper survey b) the first 5 students completing an assignment c) every third person to arrive at the bank d) registered voters in a county
d) registered voters in a county
42. The power of a statistical test is a) the probability of not rejecting H0 when it is false b) the probability of rejecting H0 when it is true c) the probability of not rejecting H0 when it is true d) the probability of rejecting H0 when it is false
d) the probability of rejecting H0 when it is false
65. What is the standard deviation for the following population of scores? Scores: 1, 3, 7, 4, 5 a. 20 b. 5 c. 4 d. 2
d. 2
83. A negative value for a correlation indicates which of the following? a. much stronger relationship than if the correlation were positive b. a much weaker relationship than if the correlation were positive c. increases in X tend to be accompanied by increases in Y d. increases in X tend to be accompanied by decreases in Y
d. increases in X tend to be accompanied by decreases in Y
84. In the general linear equation, Y = bX + a, what is the value of b called? a. X intercept b. Y intercept c. correlation between X and Y d. slope
d. slope
71. Of the following z-score values, which one represents the most extreme location on the left-hand side of the distribution? a. z = +1.00 b. z = +2.00 c. z = −1.00 d. z = −2.00
d. z = −2.00
59. What is a distribution called when the same numbers of observations are below the mean as are above the mean? b) Proportional b) Equalized c) Wholly Uniform d) Balanced e) Symmetric
e) Symmetric
