Deck 2: Describing Data: Frequency Distributions and Graphic Presentations

Question 1

A pie chart shows the relative frequency in each class.

Answer 1

True

Question 2

A suggested class interval can be determined by the formula:

Answer 2

True

Question 3

When constructing a frequency distribution,try to include overlapping stated class limits,such as 100 up to 201,200 up to 301,and 300 up to 401.

Answer 3

False

Question 4

When a frequency distribution is exhaustive,each individual,object,or measurement from a sample or population must appear in at least one category.

Question 5

A pie chart shows the number of observations in each class.

Question 6

To construct a histogram,the class frequencies are plotted on the vertical or Y-axis and either the stated limits,the true limits or the midpoints are plotted on the horizontal or X-axis.

Question 7

A frequency distribution for qualitative data shows the number of observations in each class.

Question 8

A frequency distribution for quantitative data has class limits.

Question 9

In constructing a frequency distribution,you should try to have open-ended classes such as "Under $100" and "$1,000 and over".

Question 10

A frequency distribution for qualitative data has class limits.

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

A pie chart is similar to a relative frequency distribution.

Question 17

To summarize the gender of students attending a college,a frequency distribution groups data into two classes.

Question 18

The midpoint of a class,which is also called a class mark,is halfway between the lower and upper limits.

Question 19

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

Question 20

A frequency distribution groups data into classes showing the number of observations in each class.

Question 21

For quantitative data,the relative frequency for a class is computed as the

A)class width divided by class interval.
B)class midpoint divided by the class frequency.
C)class frequency divided by the class interval.
D)class frequency divided by the total frequency.

Question 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 is summarized in the following table: Why is the table NOT a frequency distribution?

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.

Question 23

The monthly salaries of a sample of 100 employees were rounded to the nearest ten dollars.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
E)None of the above

Question 24

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)histogram.
B)raw data.
C)frequency distribution.
D)frequency polygon.

Question 25

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

Question 26

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.

Question 27

When a class interval is expressed as: 100 up to 200,

A)Observations with values of 100 are excluded from the class frequency.
B)Observations with values of 200 are included in the class frequency.
C)Observations with values of 200 are excluded from the class frequency.
D)The class interval is 99.

Question 28

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

Question 29

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)Histogram
B)Class limits
C)Class frequencies
D)Raw data

Question 30

In general,we should construct a frequency distribution so that there are either 4 or 24 classes.

Question 31

When data is collected using a qualitative,nominal 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)Number of classes is equal to the number of variable's values plus 2.
D)The "5 to the k rule" can be applied.

Question 32

For qualitative data,the relative frequency for a class is computed as the

A)class width divided by class interval.
B)class midpoint divided by the class frequency.
C)class frequency divided by the class interval.
D)class frequency divided by the total frequency.

Question 33

The height of a bar in a histogram represents the number of observations for a class.

Question 34

In a frequency distribution,the number of observations in a class is called class

A)midpoint
B)interval
C)array
D)frequency

Question 35

When data is collected using a qualitative,nominal variable,i.e. ,male or female,what is true about a frequency distribution that summarizes the data?

A)Upper and lower class limits must be calculated.
B)Class midpoints can be computed.
C)Number of classes corresponds to number of the variable's values.
D)The "2 to the k rule" can be applied.

Question 36

A relative frequency distribution shows the number of observations in each class.

Question 37

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

Question 38

A group of 100 students were surveyed about their interest in a new International Studies program.Interest was measured in terms of high,medium,or low.30 students responded high interest;40 students responded medium interest;30 students responded low interest.What is the relative frequency of students with high interest?

A)30%
B)50%
C)40%
D)Cannot be determined

Question 39

What is the following table called?

A)Histogram
B)Frequency polygon
C)Cumulative frequency distribution
D)Frequency distribution

Question 40

When data is 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)Number of classes is equal to the number of variable's values.
D)The "5 to the k rule" can be applied.

Question 41

Refer to the following distribution of ages: What is the class interval?

A)9
B)10
C)10.5
D)11

Question 42

Refer to the following distribution of commissions: What is the relative frequency for those salespersons that earn from $1,600 up to $1,800?

A)2%
B)2.4%
C)20%
D)24%
E)None of the above

Question 43

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

Question 44

Refer to the following distribution: What is the relative class frequency for the $25 up to $35 class?

A)2%
B)4%
C)5%
D)10%

Question 45

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"

Question 46

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

Question 47

A sample distribution of hourly earnings in Paul's Cookie Factory is: 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

Question 48

Refer to the following distribution of commissions: What is the relative frequency of those salespersons that earn more than $1,599?

A)25.5%
B)27.5%
C)29.5%
D)30.8%

Question 49

Refer to the following distribution: What are the class limits for class with the highest frequency?

A)55 and 64
B)54 and 64
C)55 and up to 65
D)55 and 64.5

Question 50

Refer to the following distribution of ages: What is the class midpoint of the highest class?

A)54
B)55
C)64
D)65

Question 51

Why are unequal class intervals sometimes used in a frequency distribution?

A)To avoid a large number of empty classes
B)For the sake of variety in presenting the data
C)To make the class frequencies smaller
D)To avoid the need for midpoints

Question 52

Refer to the following distribution of ages: For the distribution of ages above,what is the relative class frequency for the lowest class?

A)50%
B)18%
C)20%
D)10%

Question 53

Refer to the following distribution of commissions: The first plot for a cumulative frequency distribution would be:

A)X = 0,Y = 600.
B)X = 600,Y = 3.
C)X = 3,Y = 600.
D)X = 600,Y = 0.

Question 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

Question 55

Refer to the following wage breakdown for a garment factory. What is the class interval for the table of wages above?

A)$2
B)$3
C)$4
D)$5

Question 56

The age distribution of a sample of part-time employees at Lloyd's Fast Food Emporium is: What type of chart should be drawn to present this data?

A)Histogram
B)Simple line chart
C)Cumulative Frequency Distribution
D)Pie chart
E)Frequency polygon

Question 57

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

Question 58

Refer to the following wage breakdown for a garment factory. What are the class limits for the class with the smallest frequencies?

A)3.5 and 6.5
B)4 and up to 7
C)13 and up to 16
D)12.5 and 15.5

Question 59

Refer to the following distribution of commissions: For the distribution above,what is the midpoint of the class with the greatest frequency?

A)1400
B)1500
C)1700
D)The midpoint cannot be determined

Question 60

Refer to the following distribution of commissions: What is the class interval?

A)200
B)300
C)3.500
D)400

Question 61

A frequency distribution for nominal data requires that the categories be ___________________ and _______________________.

Question 62

Draw a bar graph that illustrates the frequency table above.

Question 63

Refer to the following breakdown of responses to a survey of room cleanliness in a hotel. What is the class interval for the frequency table above?

A)10
B)20
C)40
D)None of the above

Question 64

Refer to the following class marks or midpoints for a frequency distribution of "weights of college men" recorded to the nearest pound:
The first three class marks are 105,115,and 125.
What is the upper limit for the third class? _______

Question 65

What is the number of observations in each class of a frequency distribution called?__________________________

Question 66

Refer to the following frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent more than six days or more?

A)8
B)4
C)22
D)31

Question 67

In constructing a frequency polygon,class frequencies are scaled on which axis? ______

Question 68

The midpoint of a class interval is also called a __________.

Question 69

Refer to the following frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent from 6 up to 12 days?

A)20
B)8
C)12
D)17

Question 70

Refer to the following breakdown of responses to a survey of room cleanliness in a hotel. What percent of the responses indicated that customers were satisfied?

A)20
B)25%
C)50%
D)100%

Question 71

For a frequency distribution of quantitative data,if every individual,object or measurement can be assigned to a class,the frequency distribution is ____________.

Question 72

What chart or graph is useful to display a relative frequency distribution for a nominal variable? _______________________

Question 73

Refer to the following breakdown of responses to a survey of room cleanliness in a hotel. What is the class with the greatest frequency?

A)Not satisfied
B)Satisfied
C)Highly satisfied
D)None of the above

Question 74

For a frequency distribution of qualitative data,if the observations can be assigned to only one class,the classes are ____________________________.

Question 75

When classes in a frequency table are constructed so that each observation will fit into only one class,the categories are ________________________.

Question 76

Unorganized data is referred to as ________ data.

Question 77

A table showing the number of observations that have been grouped into each of several classes is called a _____________________.

Question 78

Refer to the following frequency distribution on days absent during a calendar year by employees of a manufacturing company: How many employees were absent between 3 up to 6 days?

A)31
B)29
C)14
D)2

Question 79

Draw a bar graph that illustrates the relative frequencies.

Question 80

Refer to the following frequency distribution on 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