# Quiz 2: Describing Data: Frequency Tables,Frequency Distributions,and Graphic Presentation

Statistics

Q 1Q 1

A frequency distribution is a grouping of quantitative data into overlapping classes showing the number of observations in each class.

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True False

False

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True False

False

Q 3Q 3

To summarize the gender of students attending a college,the number of classes in a frequency table depends on the number of students.

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True False

False

Q 4Q 4

In frequency distributions,classes are mutually exclusive if each individual,object,or measurement is included in only one category.

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True False

Q 5Q 5

In a bar chart,the horizontal axis is usually labeled with the values of a qualitative variable.

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True False

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True False

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True False

Q 8Q 8

A class interval can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.

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True False

Q 9Q 9

To convert a frequency distribution to a relative frequency distribution,divide each class frequency by the sum of the class frequencies.

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True False

Q 10Q 10

To convert a frequency distribution to a relative frequency distribution,divide each class frequency by the number of classes.

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True False

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True False

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True False

Q 13Q 13

To construct a pie chart,relative class frequencies are used to graph the "slices" of the pie.

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True False

Q 14Q 14

A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values.

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True False

Q 15Q 15

A frequency polygon is a very useful graphic technique when comparing two or more distributions.

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True False

Q 16Q 16

Monthly commissions of first-year insurance brokers are $1,270,$1,310,$1,680,$1,380,$1,410,$1,570,$1,180,and $1,420. These figures are referred to as
A)a histogram.
B)raw data.
C)a frequency distribution.
D)a frequency polygon.

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Multiple Choice

Q 17Q 17

A small sample of computer operators shows monthly incomes of $1,950,$1,775,$2,060,$1,840,$1,795,$1,890,$1,925,and $1,810. What are these ungrouped numbers called?
A)Histograms
B)Class limits
C)Class frequencies
D)Raw data

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Multiple Choice

Q 18Q 18

When data are collected using a quantitative,ratio variable,what is true about a frequency distribution that summarizes the data?
A)Upper and lower class limits must be calculated.
B)A pie chart can be used to summarize the data.
C)The number of classes is equal to the number of variable values.
D)The "5 to the k rule" can be applied.

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Multiple Choice

Q 19Q 19

When data are collected using a qualitative,nominal variable,what is true about a frequency table that summarizes the data?
A)The upper and lower class limits must be calculated.
B)A pie chart can be used to summarize the data.
C)The number of classes is equal to the number of variable's values plus 2.
D)The "5 to the k rule" can be applied.

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Multiple Choice

Q 20Q 20

When data are collected using a qualitative,nominal variable (e.g.,male or female),what is true about a frequency table that summarizes the data?
A)The upper and lower class limits must be calculated.
B)Class midpoints can be computed.
C)The number of classes corresponds to the number of a variable's values.
D)The "2 to the k rule" can be applied.

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Multiple Choice

Q 21Q 21

A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table: What is wrong with this frequency table?
A)The number of males does not equal the sum of males that smoke and do not smoke.
B)The classes are not mutually exclusive.
C)There are too many classes.
D)Class limits cannot be computed.

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Multiple Choice

Q 22Q 22

A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table: What type of chart best represents the frequency table?
A)Bar chart
B)Box plot
C)Scatter plot
D)Frequency polygon

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Multiple Choice

Q 23Q 23

A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table: What type of chart best represents the relative class frequencies?
A)Box plot
B)Pie chart
C)Scatter plot
D)Frequency polygon

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Multiple Choice

Q 24Q 24

When a class interval is expressed as 100 up to 200,
A)observations with values of 100 are excluded from the class.
B)observations with values of 200 are included in the class.
C)observations with values of 200 are excluded from the class.
D)the class interval is 99.

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Multiple Choice

Q 25Q 25

For a relative frequency distribution,relative frequency is computed as
A)the class width divided by the class interval.
B)the class midpoint divided by the class frequency.
C)the class frequency divided by the class interval.
D)the class frequency divided by the number of observations.

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Multiple Choice

Q 26Q 26

The relative frequency for a class represents the
A)class width.
B)class midpoint.
C)class interval.
D)percentage of observations in the class.

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Multiple Choice

Q 27Q 27

A group of 100 students was surveyed about their interest in a new International Studies program. Interest was measured in terms of high,medium,or low. In the study,30 students responded high interest,40 students responded medium interest,and 30 students responded low interest. What is the relative frequency of students with high interest?
A)0.30
B)0.50
C)0.40
D)0.030

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Multiple Choice

Q 28Q 28

A group of 100 students were surveyed about their interest in a new Economics major. Interest was measured in terms of high,medium,or low. In the study,30 students responded high interest,50 students responded medium interest,and 20 students responded low interest. What is the best way to illustrate the relative frequency of student interest?
A)Use a cumulative frequency polygon.
B)Use a box plot.
C)Use a pie chart.
D)Use a frequency table.

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Multiple Choice

Q 29Q 29

The monthly salaries of a sample of 100 employees were rounded to the nearest $10. They ranged from a low of $1,040 to a high of $1,720. If we want to condense the data into seven classes,what is the most convenient class interval?
A)$50
B)$100
C)$150
D)$200

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Multiple Choice

Q 30Q 30

A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify themselves as a Democrat or a Republican. This question is flawed because
A)students generally don't know their political preferences.
B)the categories are generally mutually exclusive.
C)the categories are not exhaustive.
D)political preference is a continuous variable.

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Multiple Choice

Q 31Q 31

A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preferences-for example,Democrat,Republican,Libertarian,or another party. The best way to illustrate the frequencies for each political preference is a
A)bar chart.
B)box plot.
C)histogram.
D)frequency polygon.

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Multiple Choice

Q 32Q 32

A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preferences-for example,Democrat,Republican,Libertarian,or another party. The best way to illustrate the relative frequency distribution is a
A)bar chart.
B)pie chart.
C)histogram.
D)frequency polygon.

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Multiple Choice

Q 33Q 33

What is the following table called?
A)Histogram
B)Frequency polygon
C)Cumulative frequency distribution
D)Frequency distribution

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Multiple Choice

Q 34Q 34

For the following distribution of heights,what are the limits for the class with the greatest frequency?
A)64 and up to 70
B)65 and 69
C)65 and up to 70
D)69.5 and 74.5

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Multiple Choice

Q 35Q 35

In a frequency distribution,the number of observations in a class is called the class
A)midpoint.
B)interval.
C)array.
D)frequency.

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Multiple Choice

Q 36Q 36

Why are unequal class intervals sometimes used in a frequency distribution?
A)To avoid a large number of classes with very small frequencies.
B)For the sake of variety in presenting the data.
C)To make the class frequencies smaller.
D)To avoid the need for midpoints.

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Multiple Choice

Q 37Q 37

The number of employees less than the upper limit of each class at Lloyd's Fast Food Emporium is shown in the following table: What is it called?
A)A histogram
B)A cumulative frequency distribution
C)A pie chart
D)A frequency polygon

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Multiple Choice

Q 38Q 38

Here is a sample distribution of hourly earnings in Paul's Cookie Factory: The limits of the class with the smallest frequency are
A)$6.00 and $9.00.
B)$12.00 and up to $14.00.
C)$11.75 and $14.25.
D)$12.00 and up to $15.00.

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Multiple Choice

Q 39Q 39

Refer to the following distribution of commissions: What is the relative frequency for salespeople who earn from $1,600 up to $1,800?
A)0.02
B)0.024
C)0.20
D)0.24

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Multiple Choice

Q 40Q 40

Refer to the following distribution of commissions: To plot a cumulative frequency distribution,the first coordinate would be
A)X = 0,Y = 600.
B)X = 500,Y = 3.
C)X = 3,Y = 600.
D)X = 600,Y = 0.

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Multiple Choice

Q 41Q 41

Refer to the following distribution of commissions: What is the relative frequency of salespeople who earn $1,600 or more?
A)25.5%
B)27.5%
C)29.5%
D)30.8%

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Multiple Choice

Q 42Q 42

Refer to the following distribution of commissions: For the preceding distribution,what is the midpoint of the class with the greatest frequency?
A)1,400
B)1,500
C)1,700
D)The midpoint cannot be determined.

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Multiple Choice

Q 43Q 43

Refer to the following distribution of commissions: What is the class interval?
A)200
B)300
C)3,500
D)400

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Multiple Choice

Q 44Q 44

Refer to the following wage breakdown for a garment factory: What is the class interval for the preceding table of wages?
A)$2
B)$3
C)$4
D)$5

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Multiple Choice

Q 45Q 45

Refer to the following wage breakdown for a garment factory: What is the class midpoint for the class with the greatest frequency?
A)$5.50
B)$8.50
C)$11.50
D)$14.50

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Multiple Choice

Q 46Q 46

Refer to the following wage breakdown for a garment factory: What are the class limits for the class with the smallest frequency?
A)3.5 and 6.5
B)4 and up to 7
C)13 and up to 16
D)12.5 and 15.5

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Multiple Choice

Q 47Q 47

Refer to the following distribution of ages: For this distribution of ages,what is the relative class frequency for the lowest class?
A)0.50
B)0.18
C)0.20
D)0.10

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Multiple Choice

Q 48Q 48

Refer to the following distribution of ages: What is the class interval?
A)9
B)10
C)10.5
D)11

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Multiple Choice

Q 49Q 49

Refer to the following distribution of ages: What is the class midpoint of the highest class?
A)54
B)55
C)64
D)65

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Multiple Choice

Q 50Q 50

Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What is the class interval?
A)1"
B)2"
C)2.5"
D)3"

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Multiple Choice

Q 51Q 51

Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What are the class limits for the lowest class?
A)61 and up to 64
B)62 and up to 64
C)62 and 65
D)62 and 63

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Multiple Choice

Q 52Q 52

Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What are the class limits for the third class?
A)64 and up to 67
B)67 and 69
C)67 and up to 70
D)66 and 68

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Multiple Choice

Q 53Q 53

Refer to the following distribution: What is the relative class frequency for the $25 up to $35 class?
A)0.02
B)0.04
C)0.05
D)0.10

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Multiple Choice

Q 54Q 54

Refer to the following distribution: What is the class midpoint for the $45 up to $55 class?
A)49
B)49.5
C)50
D)50.5

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Multiple Choice

Q 55Q 55

Refer to the following distribution: What are the class limits for the class with the highest frequency?
A)55 up to 64
B)54 up to 64
C)55 up to 65
D)55 up to 64.5

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Multiple Choice

Q 56Q 56

Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent for 3 up to 6 days?
A)31
B)29
C)14
D)2

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Multiple Choice

Q 57Q 57

Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent fewer than six days?
A)60
B)31
C)91
D)46

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Multiple Choice

Q 58Q 58

Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent six or more days?
A)8
B)4
C)22
D)31

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Multiple Choice

Q 59Q 59

Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: How many employees were absent for 6 up to 12 days?
A)20
B)8
C)12
D)17

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Multiple Choice

Q 60Q 60

Refer to the following breakdown of responses to a survey of room service in a hotel: What is the class interval for this frequency table?
A)10
B)20
C)40
D)None apply

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Multiple Choice

Q 61Q 61

Refer to the following breakdown of responses to a survey of room service in a hotel: What is the class with the greatest frequency?
A)Not satisfied
B)Satisfied
C)Highly satisfied
D)None apply

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Multiple Choice

Q 62Q 62

Refer to the following breakdown of responses to a survey of room service in a hotel: What percentage of the responses indicated that customers were satisfied?
A)40%
B)33%
C)50%
D)100%

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Multiple Choice

Q 63Q 63

Refer to the following breakdown of responses to a survey of room service in a hotel: What type of chart should be used to describe the frequency table?
A)A pie chart
B)A bar chart
C)A histogram
D)A frequency polygon

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Multiple Choice

Q 64Q 64

Refer to the following breakdown of responses to a survey of room service in a hotel: What type of chart should be used to show relative class frequencies?
A)A pie chart
B)A bar chart
C)A histogram
D)A frequency polygon

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Multiple Choice

Q 65Q 65

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What is the class interval for the preceding frequency table?
A)10
B)20
C)40
D)None apply

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Multiple Choice

Q 66Q 66

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What is the class with the greatest frequency?
A)Very concerned
B)Somewhat concerned
C)No concern
D)None apply

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Multiple Choice

Q 67Q 67

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What percentage of the responses indicated that users were somewhat concerned?
A)40%
B)70%
C)20%
D)100%

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Multiple Choice

Q 68Q 68

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What type of chart should be used to describe the frequency table?
A)A pie chart
B)A bar chart
C)A histogram
D)A frequency polygon

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Multiple Choice

Q 69Q 69

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What type of chart should be used to show relative class frequencies?
A)A pie chart
B)A bar chart
C)A histogram
D)A frequency polygon

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Multiple Choice

Q 70Q 70

Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What is the class interval for the preceding frequency table?
A)10
B)20
C)40
D)None apply

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Multiple Choice

Q 71Q 71

Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What is the class with the greatest frequency?
A)Very confident
B)Somewhat confident
C)Not very confident
D)Don't know

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Multiple Choice

Q 72Q 72

Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What percentage of the responses indicated that users were very confident?
A)63%
B)21%
C)45%
D)33%

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Multiple Choice

Q 73Q 73

Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What type of chart should be used to describe the frequency table?
A)A pie chart
B)A bar chart
C)A histogram
D)A frequency polygon

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Multiple Choice

Q 74Q 74

Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What type of chart should be used to show relative class frequencies?
A)A pie chart
B)A bar chart
C)A histogram
D)A frequency polygon

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Multiple Choice

Q 75Q 75

A pie chart shows the
A)relative frequencies of a qualitative variable.
B)relative frequencies of a quantitative variable.
C)frequencies of a nominal variable.
D)frequencies of a ratio variable.

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Multiple Choice

Q 76Q 76

A table summarizing a set of data showing the fraction of the total number of items in several classes is a
A)relative frequency table.
B)frequency table.
C)normal frequency table.
D)cumulative frequency table.

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Multiple Choice

Q 77Q 77

In order to convert class frequency to relative class frequency,we
A)divide the midpoint of the class by the sample size.
B)divide the frequency of the class by the midpoint.
C)divide the sample size by the frequency of the class.
D)divide the frequency of the class by the sample size.

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Multiple Choice

Q 78Q 78

In constructing a frequency distribution,the approximate class interval is computed as
A)(maximum value − minimum value)/(number of classes).
B)(maximum value − minimum value)/(sample size).
C)(minimum value − maximum value)/(sample size).
D)(maximum value)/(number of classes − sample size).

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Multiple Choice