Statistics Exam 1 Chapters 1-3

D. both a bar graph and a pie chart

Fifteen percent of the students in a school of Business Administration are majoring in Economics, 20% in Finance, 35% in Management, and 30% in Accounting. The graphical device( s) which can be used to present these data is (are): A. a line graph B. only a pie chart C. only a bar graph D. both a bar graph and a pie chart

A. only with quantitative data

Ordinary arithmetic operations are meaningful: A. only with quantitative data B. either with quantitative or qualitative data C. only with qualitative data D. None of the above answers is correct

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. The mean is a measure of the deviation in a data set.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A relative frequency distribution describes the proportion of data values that fall within each category.

Ordinal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? Would your overall rating of this tour be excellent, good, fair, or poor?

C. y = b0+b1x

Regarding linear equations with one independent variable: Which is the general form of such an equation: A. y = b0x+b1z B. y = b0xb1 C. y = b0+b1x D. y = b0=x+b1 E. y = b0+b1x2

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Interval data may be treated as ordinal or nominal.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Interval data, such as heights, weights, and incomes, are also referred to as quantitative or numerical data.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Quantitative variables usually represent membership in groups or categories.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Statistical inference is the process of making an estimate, prediction, or decision about a population based on sample data.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? The graphical technique used to describe the relationship between two interval variables is the scatter diagram.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? The length of the box in a box-and-whisker plot portrays the interquartile range.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? The mean is one of the most frequently used measures of variability.

B. 95%

The Empirical Rule states that the approximate percentage of measurements in a data set (providing that the data set has a bell-shaped distribution) that fall within two standard deviations of their mean is approximately: A. 68% B. 95% C. 75% D. 99%

A. a constant

The letter b0 is A. a constant B. the independent variable C. the dependent variable D. none of the above

A. a constant

The letter b1 is A. a constant B. the independent variable C. the dependent variable D. none of the above

B. the independent variable

The letter x is A. a constant B. the independent variable C. the dependent variable D. none of the above

C. the dependent variable

The letter y is A. a constant B. the independent variable C. the dependent variable D. none of the above

B. multiplying the relative frequency by 100

The percent frequency of a class is computed by: A. adding 100 to the relative frequency B. multiplying the relative frequency by 100 C. multiplying the relative frequency by 10 D. dividing the relative frequency by 100

B. parameter

The population proportion is a A. statistic B. parameter C. None of the above

C. dividing the frequency of the class by the sample size

The relative frequency of a class is computed by: A. dividing the frequency of the class by the midpoint B. dividing the midpoint of the class by the sample size C. dividing the frequency of the class by the sample size D. dividing the sample size by the frequency of the class

B. statistic

The sample proportion is a A. parameter B. statistic C. None of the above

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? The total area of the six bars in a relative frequency histogram for which the width of each bar is five units is 1.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? There are actually four types of data: nominal, ordinal, interval, and ratio. However, for statistical purposes, there is no difference between interval and ratio data, and the authors of your book combine the two types.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Two classifications of statistical descriptions are measures of central location and measures of variability.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. In a negatively skewed distribution, the mean is smaller than the median and the median is smaller than the mode.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. Measures of variability describe typical values in the data.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? In the term 'frequency distribution', frequency refers to the number of data values falling within each class.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Individual observations within each class may be found in a frequency distribution.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? The class interval in a frequency distribution is the number of data values that fall within each class.

True

Select True or False from each pull-down menu, depending whether the corresponding statement is true or false. ? A relative frequency distribution describes the proportion of data values that fall within each category.

True

Select True or False from each pull-down menu, depending whether the corresponding statement is true or false. ? A relative frequency distribution describes the proportion of data values that fall within each class, and may be presented in a histogram form.

False

Select True or False from each pull-down menu, depending whether the corresponding statement is true or false. ? Individual observations within each class may be found in a frequency distribution.

False

Select True or False from each pull-down menu, depending whether the corresponding statement is true or false. ? The class interval in a frequency distribution is the number of data values that fall within each class.

E. can be smaller than, larger than, or equal to the sample mean

Since the population is always larger than the sample, the population mean: A. is always smaller than or equal to the sample mean B. is always larger than the sample mean C. is always smaller than the sample mean D. is always larger than or equal to the sample mean E. can be smaller than, larger than, or equal to the sample mean

C. The intervals in a frequency distribution may overlap to ensure that each observation is assigned to an interval

Which of the following statements is false? A. A frequency distribution counts the number of observations that fall into each of a series of intervals, called classes that cover the complete range of observations B. Although the frequency distribution provides information about how the numbers in the data set are distributed, the information is more easily understood and imparted by drawing a histogram C. The intervals in a frequency distribution may overlap to ensure that each observation is assigned to an interval D. The number of class intervals we select in a frequency distribution depends entirely on the number of observations in the data set

C. the range

Which of the following summary measures is affected most by outliers? A. The median B. The geometric mean C. The range D. The interquartile range E. All of the above

Ordinal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? The letter grades received by students in a computer science class

A. the largest number of observations

A modal class is the class that includes: A. the largest number of observations B. the smallest number of observations C. the largest observation in the data set D. the smallest observation in the data set

B. sample

A set of measurements collected from a population is called a: A. variables B. sample C. statistic D. None of the above answers is correct

Ordinal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? The size of fries (small, medium, large) ordered by a sample of Burger King customers

Ordinal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? What grade did you receive in Statistics last semester; A, B, C, D, or F?

Interval

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? What is the current temperature outside?

QUALITATIVE

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (d) The marital status of your coworkers.

Interval

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? What is the maximum number of hours per day that you would like to spend travelling?

B. the y-intercept

Consider the linear equation y = b0+b1x. a. In the equation, b0 is A. the slope B. the y-intercept C. the independent variable D. the dependent variable

D. the slope

Consider the linear equation y = b0+b1x. b. In the equation, b1 is A. the independent variable B. the dependent variable C. the y-intercept D. the slope

B. the y-value where the straight line graph of the linear equation intersects the y-axis

Consider the linear equation y = b0+b1x. c. Give the geometric interpretation of b0. It indicates A. the x-value where the straight-line graph of the linear equation intersects the x-axis B. the y-value where the straight-line graph of the linear equation intersects the y-axis C. how much the y-value on the straight line changes when the x-value increases by unit D. how much the x-value on the straight line changes when the y-value increases by unit

A. how much the y-value on the straight line changes when the x-value increases by unit

Consider the linear equation y = b0+b1x. d. Give the geometric interpretation of b1. It indicates A. how much the y-value on the straight line changes when the x-value increases by unit B. the y-value where the straight-line graph of the linear equation intersects the y-axis C. how much the x-value on the straight line changes when the y-value increases by unit D. the x-value where the straight-line graph of the linear equation intersects the x-axis

Quantitative

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (a) The amount of bacteria on a piece of moldy bread.

Interval

Determine whether the following possible responses should be classified as interval, nominal or ordinal data ? What is the current temperature outside?

Nominal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data ? What is your political party affiliation?

Nominal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data ? Which of the following features of the hotel in New York did you find most attractive: location, facilities, room size, or price?

Nominal

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? Your hometown

Interval

Determine whether the following possible responses should be classified as interval, nominal or ordinal data. ? The age of each of your classmates

Qualitative

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (b) The occupation of your neighbors.

Qualitative

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (c) The marital status of your coworkers.

QUALITATIVE

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (c) The occupation of your neighbors.

A. can be either numeric or nonnumeric

Data obtained from a nominal scale: A. can be either numeric or nonnumeric B. must be alphabetic C. must be numeric D. must rank order the data

CONTINUOUS

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (a) The distance traveled by a city bus each day.

Discrete

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (a) The number of errors found on a student's research paper. answer: answer:

Continuous

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (b) The length of time it takes to fill up your gas tank. answer:

DISCRETE

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (b) The number of customers waiting in line at the grocery store.

DISCRETE

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (c) The number of voters who vote Democratic.

Continuous

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (c) The temperature in any given location. answer:

CONTINUOUS

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (d) The length of time it takes to fill up your gas tank.

Continuous

Determine whether the following examples are discrete or continuous data sets. Write "DISCRETE" for discrete and "CONTINUOUS" for continuous. (without quotations) (d) The length of time needed for a student to complete a homework assignment.

QUANTITATIVE

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (a) Your college GPA.

QUANTITATIVE

Determine whether the following examples of data are quantitative or qualitative. Write "QUANTITATIVE" for quantitative and "QUALITATIVE" for qualitative. (without quotations) (b) The amount of bacteria on a piece of moldy bread.

A. are labels used to identify attributes of elements

Qualitative data: A. are labels used to identify attributes of elements B. must be nonnumeric C. cannot be numeric D. indicate either how much or how many

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A bimodal histogram is one with two peaks equal in height.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A data sample has a mean of 107, a median of 122, and a mode of 134. The distribution of the data is positively skewed.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A frequency distribution is a listing of the individual observations arranged in ascending or descending order.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A histogram is said to be symmetric if, when we draw a vertical line down the center of the histogram, the two sides are identical in shape and size.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A local cable system using a sample of 500 subscribers estimates that forty percent of its subscribers watch a premium channel at least once per day. This is an example of statistical inference as opposed to descriptive statistics.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A skewed histogram is one with a long tail extending either to the right or left. The former is called negatively skewed, and later is called positively skewed

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A stem-and-leaf display describes two-digit integers between 20 and 70. For one of the classes displayed, the row appears as 4—256. the numerical values being described are 24, 54, and 64.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? A variable is some characteristic of a population, while data are the observed values of a variable based on a sample.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? ATP singles rankings for tennis players is an example of an interval scale.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? According to Chebyshev's theorem, at least 93.75% of observations should fall within 4 standard deviations of the mean.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Chebyshev's theorem states that the percentage of observations in a data set that should fall within five standard deviations of the mean is at least 96%.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? Conclusions and estimates about a population based on sample data are not always going to be correct. For this reason measures of reliability, such a significance level and confidence level, should be built into the statistical inference.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? If we draw a straight line through the points in a scatter diagram and most of the points fall close to the line, we say that there is a positive linear relationship between the two variables.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? In a bell shaped distribution, there is no difference in the values of the mean, median, and mode.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? In a histogram, the proportion of the total area which must be to the left of the median is less than 0.50 if the distribution is skewed to the left.

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? In a negatively skewed distribution, the mean is smaller than the median and the median is smaller than the mode

True

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? In a positively skewed distribution, then mean is larger than the median and the median is larger than the mode.

False

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? In a sample of 500 students at a university, 12% of them are accounting majors. The 12% is an example of statistical inference.

c. continuous, quantitative data

a - Qualitative data b - Discrete, quantitative data c - Continuous, quantitative data Fill in the appropriate letter (from above) of the term defined in each of the parts below. a) Data obtained by observing numerical values which form some interval of numbers

a. qualitative data

a - Qualitative data b - Discrete, quantitative data c - Continuous, quantitative data Fill in the appropriate letter (from above) of the term defined in each of the parts below. b) Data obtained from a nonnumerically valued variable answer:

b. discrete, quantitative data

a - Qualitative data b - Discrete, quantitative data c - Continuous, quantitative data Fill in the appropriate letter (from above) of the term defined in each of the parts below. c) Data obtained by observing numerical values which form a finite, or countably infinite, set of numbers answer: