EC220 - all exams and quizzes

A numerical measure from a population, such as a population mean, is called _____. Select one: a. a parameter b. a sample c. a statistic d. the mean deviation

a. a parameter

A weighted average of the value of a random variable, where the probability function provides weights, is known as _____. Select one: a. the expected value b. None of the answers is correct. c. a random variable d. a probability function

a. the expected value

In constructing a frequency distribution, as the number of classes is decreased, the class width _____. Select one: a. decreases b. increases c. remains unchanged d. can increase or decrease depending on the data values

b. increases

The expected value of a random variable is the _____. Select one: a. median value b. mean value c. simple average of all the possible values d. most probable value

b. mean value

A population consists of 500 elements. We want to draw a simple random sample of 50 elements from this population. On the first selection, the probability of an element being selected is _____. Select one: a. .010 b. .100 c. .002 d. .001

c. .002

If A and B are mutually exclusive events with P(A) = .3 and P(B) = .5, then P(A∪B) = Select one: a. .2 b. 0 c. .8 d. .15

c. .8

Given that z is a standard normal random variable, what is the value of z if the area to the right of zis .1401? Select one: a. 2.16 b. .1401 c. 1.08 d. -1.08

c. 1.08

Suppose annual salaries for sales associates from Geoff's Computer Shack have a mean of $32,500 and a standard deviation of $2,500. Use Chebyshev's theorem to calculate the percentage of sales associates with salaries between $26,250 and $38,750. Select one or more: a. 75% b. 84% c. 95% d. 68%

b. 84%

Exhibit 6-6The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. Refer to Exhibit 6-6. What is the random variable in this experiment? Select one: a. 40,000 miles b. Life expectancy of this brand of tire c. Normal distribution d. None of the answers is correct.

b. Life expectancy of this brand of tire

The multiplication law is potentially helpful when we are interested in computing the probability of _____. Select one: a. mutually exclusive events b. the union of two events c. the intersection of two events d. None of the answers is correct.

c. the intersection of two events

The collection of all possible sample points in an experiment is _____. Select one: a. the population b. a sample point c. the sample space d. an experiment

c. the sample space

In Excel, the line of best fit for the points in a scatter diagram is called a _____. Select one: a. fit line b. vertical line c. trendline d. horizontal line

c. trendline

The following estimated regression model was developed relating yearly income (y in $1000s) of 30 individuals with their age (x1) and their gender (x2) (0 if male and 1 if female). ​ y^ = 30 + 0.7x1 + 3x2 ​ Also provided are SST = 1200 and SSE = 384. Refer to Exhibit 15-8. The yearly income of a 24-year-old male individual is _____. Select one: a. $46,800 b. $13.80 c. $49,800 d. $13,800

a. $46,800

Suppose annual salaries for sales associates from Hayley's Heirlooms have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $28,000 is _____. Select one: a. -1.8 b. 1.8 c. 28 d. .78

a. -1.8

If P(A) = .6, P(B) = .3, and P(A ∩ B) = .2, then P(B | A) =_____. Select one: a. .33 b. .5 c. .9 d. .67

a. .33

Exhibit 15-8 The following estimated regression model was developed relating yearly income (y in $1000s) of 30 individuals with their age (x1) and their gender (x2) (0 if male and 1 if female). ​ y^= 30 + 0.7x1 + 3x2 ​ Also provided are SST = 1200 and SSE = 384. Refer to Exhibit 15-8. The multiple coefficient of determination is _____. Select one: a. .68 b. .42 c. .32 d. .50

a. .68

Exhibit 5-7A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. Cups of Coffee ; Frequency 0 ; 700 1 ; 900 2 ; 600 3 ; 300 ; 2,500 Refer to Exhibit 5-7. The variance of the number of cups of coffee is _____. Select one: a. .96 b. 1 c. .9798 d. 2.4

a. .96

Exhibit 6-3The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. Refer to Exhibit 6-3. The probability of a player weighing less than 250 pounds is _____. Select one: a. .9772 b. .0528 c. .4772 d. .5000

a. .9772

Exhibit 6-6The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. Refer to Exhibit 6-6. What is the probability that a randomly selected tire will have a life of at least 30,000 miles? Select one: a. .9772 b. .4772 c. .0228 d. None of the answers is correct.

a. .9772

Two events, A and B, are mutually exclusive and each has a nonzero probability. If event A is known to occur, the probability of the occurrence of event B is _____. Select one: a. 0 b. any value between 0 and 1 c. any positive value d. 1

a. 0

Assume z is a standard normal random variable. What is the value of z if the area between -z and zis .754? Select one: a. 1.16 b. .377 c. .123 d. 2.16

a. 1.16

The weight (in pounds) of a sample of 36 individuals was recorded, and the following statistics were calculated. mean = 160 ; range = 60 ; mode = 165 ; variance = 324 ; median = 170 The coefficient of variation is _____. Select one: a. 11.25% b. 0.20312% c. 0.1125% d. 203.12%

a. 11.25%

Exhibit 7-3The following information was collected from a simple random sample of a population. 16 ; 19 ; 18 ; 17 ; 20 ; 18 Refer to Exhibit 7-3. The point estimate of the mean of the population is _____. Select one: a. 18.0 b. 16, since 16 is the smallest value in the sample c. 19.6 d. 108

a. 18.0

In 1998, the average age of students at UTC was 22 with a standard deviation of 3.96. In 1999, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Select one or more: a. 1998 b. 1999 c. Not enough information to determine the answer

a. 1998

Exhibit 6-6The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. Refer to Exhibit 6-6. What percentage of tires will have a life of 34,000 to 46,000 miles? Select one: a. 76.98% b. 50% c. 38.49% d. None of the answers is correct.

a. 76.98%

A sample of five Fortune 500 companies showed the following revenues ($ millions): 7505.0, 2904.7, 7208.4, 6819.0, and 19500.0. Based on this information, which of the following statements is correct? Select one: a. An estimate of the average revenue for all Fortune 500 companies is 8787.42 ($ millions). b. Over half of all Fortune 500 companies earn at least 7208.4 ($ millions) in revenues. c. The average revenue for all Fortune 500 companies is 8787.42 ($ millions). d. If five other Fortune 500 companies were chosen, the average revenue would be 8787.42 ($ millions).

a. An estimate of the average revenue for all Fortune 500 companies is 8787.42 ($ millions)

Since the median is the middle value of a data set, it must always be _____. Select one: a. None of the answers is correct. b. smaller than the mean c. smaller than the mode d. larger than the mode

a. None of the answers is correct.

Exhibit 7-4A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. Refer to Exhibit 7-4. In this problem, the .22 is _____. Select one: a. a parameter b. a statistic c. the standard error of the mean d. the average content of colognes in the long run

a. a parameter

A researcher is gathering data from four geographical areas designated: South = 1; North = 2; East = 3; West = 4. The designated geographical regions represent _____. Select one: a. categorical data b. quantitative data c. directional data d. either quantitative or categorical data

a. categorical data

A magician holds a standard deck of cards and draws one card. The probability of drawing the ace of diamonds is 1/52. What method of assigning probabilities was used? Select one: a. classical method b. experimental method c. subjective method d. objective method

a. classical method

The sample variance _____. Select one: a. could be smaller, equal to, or larger than the true value of the population variance b. is always larger than the true value of the population variance c. is always smaller than the true value of the population variance d. can never be zero

a. could be smaller, equal to, or larger than the true value of the population variance

As the sample size increases, the variability among the sample means _____. Select one: a. decreases b. depends upon the specific population being sampled c. increases d. remains the same

a. decreases

A marketing manager instructs his team to make 80 telephone calls to attempt to sell an insurance policy. The random variable in this experiment is the number of sales made. This random variable is a _____. Select one: a. discrete random variable b. complex random variable c. None of the answers is correct. d. continuous random variable

a. discrete random variable

When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement? Select one: a. interval b. nominal c. ordinal d. ratio

a. interval

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is _____. Select one: a. neither the range nor the interquartile range b. the interquartile range c. the range d. both the range and the interquartile range

a. neither the range nor the interquartile range

When the data have the properties of interval data and the multiplication or division of two values is meaningful, the variable has which scale of measurement? Select one: a. ratio b. interval c. ordinal d. nominal

a. ratio

Exhibit 1-1In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes. Refer to Exhibit 1-1. The city manager released a statement that 60% of Daisy City's 3,000 homes are in violation of city codes. The manager's statement is an example of _____. Select one: a. statistical inference b. a census c. an experiment d. descriptive statistics

a. statistical inference

In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to _____. Select one: a. the total number of elements in the data set b. None of the answers is correct. c. 100% d. 1

a. the total number of elements in the data set

A population has a mean of 80 and a standard deviation of 7. A sample of 49 observations will be taken. The probability that the mean from that sample will be larger than 82 is _____. Select one: a. .5228 b. .0228 c. .4772 d. .9772

b. .0228

Exhibit 6-3The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. Refer to Exhibit 6-3. The probability of a player weighing more than 241.25 pounds is _____. Select one: a. .9010 b. .0495 c. .9505 d. .4505

b. .0495

An experiment consists of four outcomes with P(E1) = .2, P(E2) = .3, and P(E3) = .4. The probability of outcome E4 is _____. Select one: a. .500 b. .100 c. .900 d. .024

b. .100

If a coin is tossed three times, the likelihood of obtaining three heads in a row is _____. Select one: a. 0 b. .125 c. .875 d. .500

b. .125

If A and B are independent events with P(A) = .2 and P(B) = .6, then P(A∪B) = _____. Select one: a. .12 b. .68 c. .60 d. .62

b. .68

Exhibit 6-6The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. Refer to Exhibit 6-6. What is the probability that a randomly selected tire will have a life of exactly 47,500 miles? Select one: a. .0668 b. 0 c. .9332 d. .4332

b. 0

Exhibit 2-3The number of sick days taken (per month) by 200 factory workers is summarized below. Number of Days Frequency 0−5 120 6−10 65 11−15 14 16−20 1 Refer to Exhibit 2-3. The cumulative frequency for the class of 11−15 is _____. Select one: a. 14 b. 199 c. 200 d. 1

b. 199

Exhibit 2-4A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school. Undergraduate Major Grad School ; Business ; Engineering ; Other ; Total Yes ; 35 ; 42 ; 63 ; 140 No ; 91 ; 104 ; 65 ; 260 Total ; 126 ; 146 ; 128 ; 400 ​ Refer to Exhibit 2-4. What percentage of the students does not plan to go to graduate school? Select one: a. 32% b. 65% c. 280% d. 520%

b. 65%

A continuous random variable may assume _____. Select one: a. only integer values in an interval or collection of intervals b. all values in an interval or collection of intervals c. all the positive integer values in an interval d. only fractional values in an interval or collection of intervals

b. all values in an interval or collection of intervals

If P(A) = .5 and P(B) = .5, then P(A∩B) _____. Select one: a. is 1 b. cannot be determined from the information given c. is 0 d. is .25

b. cannot be determined from the information given

A numerical measure of linear association between two variables is the _____. Select one: a. z-score b. correlation coefficient c. variance d. None of the answers is correct.

b. correlation coefficient

Exhibit 15-8 The following estimated regression model was developed relating yearly income (y in $1000s) of 30 individuals with their age (x1) and their term-3 gender (x2) (0 if male and 1 if female). ​ y^= 30 + 0.7x1 + 3x2 ​ Also provided are SST = 1200 and SSE = 384. Refer to Exhibit 15-8. From the above function, it can be said that the expected yearly income for _____. Select one: a. male is $3 more than females b. female is $3,000 more than males c. female is $3 more than males d. male is $3,000 more than females

b. female is $3,000 more than males

When the population has a normal distribution, the sampling distribution of is normally distributed _____. Select one: a. for any sample size of 50 or more b. for any sample size c. for any sample from a finite population d. for any sample size of 30 or more

b. for any sample size

A regression model between sales (y in $1000s), unit price (x1 in dollars) and television advertisement (x2 in dollars) resulted in the following function: ​ y^ = 7 - 3x1 + 5x2 ​ For this model, SSR = 3500, SSE = 1500, and the sample size is 18. Refer to Exhibit 15-2. The coefficient of x2 indicates that if television advertising is increased by $1 (holding the unit price constant), sales are expected to _____. Select one: a. decrease by $2000 b. increase by $5000 c. increase by $12,000 d. increase by $5

b. increase by $5000

Regression analysis is a statistical procedure for developing a mathematical equation that describes how _____. Select one: a. None of the answers is correct. b. one dependent and one or more independent variables are related c. one independent and one or more dependent variables are related d. several independent and several dependent variables are related

b. one dependent and one or more independent variables are related

The height and weight are recorded by the school nurse for every student in a school. What type of graph would best display the relationship between height and weight? Select one: a. histogram b. scatter diagram c. stem-and-leaf plot d. bar graph

b. scatter diagram

Exhibit 1-2 In a sample of 3,200 registered voters, 1,440, or 45%, approve of the way the president is doing his job. Refer to Exhibit 1-2. A political pollster states, "Forty five percent of all voters approve of the president." This statement is an example of _____. Select one: a. descriptive statistics b. statistical inference c. a population d. a sample

b. statistical inference

The sum of frequencies for all classes will always equal _____. Select one: a. the number of classes b. the number of elements in a data set c. 1 d. a value between 0 and 1

b. the number of elements in a data set

Which of the following descriptive statistics is NOT measured in the same units as the data? Select one: a. standard deviation b. variance c. 35th percentile d. interquartile range

b. variance

Exhibit 5-7A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. Cups of Coffee ; Frequency 0 ; 700 1 ; 900 2 ; 600 3 ; 300 ; 2,500 Refer to Exhibit 5-7. The expected number of cups of coffee is _____. Select one: a. 1.5 b. 1 c. 1.2 d. 1.7

c. 1.2

Exhibit 3-2A researcher has collected the following sample data. The mean of the sample is 5. 3 ; 5 ; 12 ; 3 ; 2 Refer to Exhibit 3-2. The variance is _____. Select one: a. 13.2 b. 4.062 c. 16.5 d. 80

c. 16.5

Exhibit 5-1The following represents the probability distribution for the daily demand of microcomputers at a local store. Demand ; Probability 0 ; .1 1. ; .2 2. ; .3 3 ; .2 4. ; .2 Refer to Exhibit 5-1. The expected daily demand is _____. Select one: a. 4 b. 2 c. 2.2 d. 1.0

c. 2.2

Suppose annual salaries for sales associates from Geoff's Computer Shack have a mean of $32,500 and a standard deviation of $2,500. Suppose that the distribution of annual salaries for sales associates at this store is bell-shaped. Use the empirical rule to determine the percentage of sales associates with salaries less than $27,500. Select one or more: a. 5% b. 10% c. 2.5% d. 13.5%

c. 2.5%

Exhibit 2-2Information on the type of industry is provided for a sample of 50 Fortune 500 companies. Industry Type Frequency Banking 7 Consumer Products. 15 Electronics. 10 Retail 18 Refer to Exhibit 2-2. The percent frequency of industries that are classified as electronics is _____. Select one: a. .10 b. 10 c. 20 d. .20

c. 20

Exhibit 7-4A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. Refer to Exhibit 7-4. The point estimate of the mean content of all bottles is _____. Select one: a. 121 b. .02 c. 4 d. .22

c. 4

Assume z is a standard normal random variable. Then P(1.41 <z< 2.85) equals _____. Select one: a. .3413 b. .4772 c. None of the answers is correct. d. .8285

c. None of the answers is correct.

Events A and B are mutually exclusive with P(A)=.3 and P(B)=.2. The probability of the complement of event B equals _____. Select one: a. .06 b. 0 c. None of the answers is correct. d. .70

c. None of the answers is correct.

Excel's __________ can be used to construct a crosstabulation. Select one: a. COUNTIF function b. Chart Tools c. PivotTable report d. SUM function

c. PivotTable report

The total number of data items with a value less than or equal to the upper limit for the class is given by the _____. Select one: a. frequency distribution b. cumulative relative frequency distribution c. cumulative frequency distribution d. relative frequency distribution

c. cumulative frequency distribution

Exhibit 1-2 In a sample of 3,200 registered voters, 1,440, or 45%, approve of the way the president is doing his job. Refer to Exhibit 1-2. The 45% approval is an example of _____. Select one: a. a sample b. statistical inference c. descriptive statistics d. a population

c. descriptive statistics

In a crosstabulation, _____. Select one: a. both variables must be categorical b. one variable must be categorical and the other must be quantitative c. either or both variables can be categorical or quantitative d. both variables must be quantitative

c. either or both variables can be categorical or quantitative

If P(A)=.50, P(B)=.60, and P(A∩B)=.30, then events A and B are _____. Select one: a. mutually exclusive events b. Not enough information is given to answer this question. c. independent events d. not independent events

c. independent events

The probability of an intersection of two events is computed using the _____. Select one: a. subtraction law b. division law c. multiplication law d. addition law

c. multiplication law

During a cold winter, the temperature stayed below zero for 10 days (ranging from -20 to -5). The variance of the temperatures of the 10 day period _____. Select one: a. can be either negative or positive b. is negative since all the numbers are negative c. must be at least zero d. cannot be computed since all the numbers are negative

c. must be at least zero

The purpose of statistical inference is to provide information about the _____. Select one: a. sample based upon information contained in the population b. mean of the sample based upon the mean of the population c. population based upon information contained in the sample d. population based upon information contained in the population

c. population based upon information contained in the sample

A numerical measure, such as a mean, computed from a population is known as a _____. Select one: a. sample parameter b. population statistic c. population parameter d. sample statistic

c. population parameter

Assume z is a standard normal random variable. Then P(z≥ 2.11) equals _____. Select one: a. .9821 b. .5 c. .4821 d. .0174

d. .0174

Exhibit 7-4A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. Refer to Exhibit 7-4. The standard error of the mean equals _____. Select one: a. .3636 b. 4.000 c. .0331 d. .0200

d. .0200

Exhibit 2-2Information on the type of industry is provided for a sample of 50 Fortune 500 companies. Industry Type Frequency Banking 7 Consumer Products. 15 Electronics. 10 Retail 18 Refer to Exhibit 2-2. The relative frequency of industries that are classified as banking is _____. Select one: a. .70 b. .07 c. 7 d. .14

d. .14

If P(A)=.62, P(B)=.56, and P(A∪B)=.70, then P(B | A)= _____. Select one: a. .9032 b. .4800 c. Not enough information is given to answer this question. d. .7742

d. .7742

Exhibit 2-3The number of sick days taken (per month) by 200 factory workers is summarized below. Number of Days ; Frequency 0−5 ; 120 6−10 ; 65 11−15 ; 14 16−20 ; 1 Refer to Exhibit 2-3. The relative frequency of workers who took 10 or fewer sick days is _____. Select one: a. 185 b. 93 c. 15 d. .925

d. .925

For any continuous random variable, the probability that the random variable takes on exactly a specific value is _____. Select one: a. 1 b. .50 c. any value between 0 and 1 d. 0

d. 0

A six-sided die is rolled three times. The probability of observing a 1 three times in a row is _____. Select one: a. 1/27 b. 1/6 c. 1/3 d. 1/216

d. 1/216

Exhibit 6-3The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. Refer to Exhibit 6-3. What is the minimum weight of the middle 95% of the players? Select one: a. None of the answers is correct. b. 196 c. 249 d. 151

d. 151

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are _____. Select one: a. 180 and 28 b. 180 and 1.74 c. 180 and 24.39 d. 180 and 2

d. 180 and 2

Which of the following is not a measure of dispersion? Select one: a. interquartile range b. range c. standard deviation d. 50th percentile

d. 50th percentile

Exhibit 6-3The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. Refer to Exhibit 6-3. What percent of players weigh between 180 and 220 pounds? Select one: a. 68.26% b. 34.13% c. 0.3413% d. None of the answers is correct

d. None of the answers is correct

Excel's _____ function can be used to compute the population standard deviation. Select one: a. STDEV.S b. STDEV c. VAR.SQRT d. None of the answers is correct.

d. None of the answers is correct.

Which of the following is NOT a characteristic of the normal probability distribution? Select one: a. The random variable assumes a value within plus or minus three standard deviations of its mean 99.72% of the time. b. The mean is equal to the median, which is also equal to the mode. c. The total area under the curve is always equal to 1. d. The graph of the curve is the shape of a rectangle.

d. The graph of the curve is the shape of a rectangle.

If r = 0.48 for data set A and r = -0.48 for data set B, which of the following is true? Select one: a. None of the answers is correct. b. The data values in A are all positive, while the data values in B are all negative. c. The variables in A are more strongly correlated than the variables in B. d. The two data sets have the same level of correlation.

d. The two data sets have the same level of correlation.

The union of events A and B is the event containing _____. Select one: a. all the sample points common to both A and B b. all the sample points belonging to A or B c. all the sample points belonging to A or B, but not both d. all the sample points belonging to A or B or both

d. all the sample points belonging to A or B or both

Any process that generates well-defined outcomes is _____. Select one: a. a sample point b. None of the answers is correct. c. an event d. an experiment

d. an experiment

The value of the sum of the squared deviations from the mean, I.e. ∑(x-x(bar))^2, must always be _____. Select one: a. either positive or negative, depending on whether the mean is negative or positive b. negative c. less than the mean d. at least zero

d. at least zero

A graphical presentation of a frequency distribution, relative frequency distribution, or percent frequency distribution of quantitative data constructed by placing the class intervals on the horizontal axis and the frequencies on the vertical axis is a _____. Select one: a. pie chart b. bar chart c. stem-and-leaf display d. histogram

d. histogram

When using Excel to create a __________, one must edit the chart to remove the gaps between rectangles. Select one: a. pie chart b. scatter diagram c. bar chart d. histogram

d. histogram

A regression model between sales (y in $1000s), unit price (x1 in dollars) and television advertisement (x2 in dollars) resulted in the following function: ​ y^ = 7 - 3x1 + 5x2 ​ For this model, SSR = 3500, SSE = 1500, and the sample size is 18. Refer to Exhibit 15-2. The coefficient of the unit price indicates that if the unit price is _____. Select one: a. decreased by $1 (holding advertising constant), sales are expected to decrease by $3 b. increased by $1 (holding advertising constant), sales are expected to increase by $3 c. increased by $1 (holding advertising constant), sales are expected to increase by $4000 d. increased by $1 (holding advertising constant), sales are expected to decrease by $3000

d. increased by $1 (holding advertising constant), sales are expected to decrease by $3000

If a qualitative variable has k levels, the number of dummy variables required is _____. Select one: a. k b. k + 1 c. 2k d. k− 1

d. k− 1

Which two scales of measurement can be either numeric or nonnumeric? Select one: a. ordinal and interval b. nominal and ratio c. interval and ordinal d. nominal and ordinal

d. nominal and ordinal

The difference between the observed value of the dependent variable and the value predicted by using the estimated regression equation is the _____. Select one: a. predicted interval b. standard error c. variance d. residual

d. residual

Six hundred residents of a city are polled to obtain information on voting intentions in an upcoming city election. The 600 residents in this study is an example of a(n) _____. Select one: a. observation b. census c. population d. sample

d. sample

The probability distribution of all possible values of the sample mean is called the ____. Select one: a. random variation b. standard error c. central probability distribution d. sampling distribution of the sample mean

d. sampling distribution of the sample mean

Which of the following is an example of categorical data? Select one: a. number of square feet of carpet b. score on a multiple-choice exam c. height, in meters, of a diving board d. social security number

d. social security number

On a December day, the probability of snow is .30. The probability of a "cold" day is .50. The probability of snow and a "cold" day is .15. Are snow and "cold" weather independent events? Select one: a. only when they are also mutually exclusive b. only if given that it snowed c. no d. yes

d. yes

The _____ denotes the number of standard deviations xi is from the mean . Select one: a. normal deviation b. variance c. median d. z-score

d. z-score