Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preference-for example, Democrat, Republican, Libertarian, or another party. The best way to illustrate the relative frequency distribution is a __________.

Accepted Answer

A)  Bar chart 
B)  Pie chart 
C)  Histogram 
D)  Frequency polygon

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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?

Accepted Answer

A)  1" 
B)  2" 
C)  2.5" 
D)  3"

Question 6

The first three class marks for a frequency distribution of "weights of college men" recorded to the nearest pound are 105, 115, and 125.
What are the class limits for the fourth class?

Accepted Answer

The answer of The first three class marks for a...

Question 7

When data is collected using a quantitative, ratio variable, what is true about a frequency distribution that summarizes the data?

Accepted Answer

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's values. 
D)  The "5 to the k rule" can be applieD.

Question 8

Ages (rounded to the nearest whole year) of employees at a large company were grouped into a distribution with the following class limits:
20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
What is the class interval?

Accepted Answer

The answer of Ages (rounded to the nearest whole year)...

Question 9

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(n) __________.

Accepted Answer

A)  Histogram 
B)  Raw data 
C)  Frequency distribution 
D)  Frequency polygon

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

The answer of A frequency distribution for nominal data requires...

Question 12

A table summarizing a set of data showing the fraction of the total number of items in several classes is a

Accepted Answer

A)  relative frequency distribution. 
B)  frequency distribution. 
C)  normal frequency distribution. 
D)  cumulative frequency distribution.

Question 13

In a deck of cards, a class of all cards that are hearts and a class of all cards that are kings are NOT _____________.

Accepted Answer

The answer of In a deck of cards, a class...

Question 14

Refer to the following distribution:  What is the class midpoint for the $45 up to $55 class?

Accepted Answer

A)  49 
B)  49.5 
C)  50 
D)  50.5

Question 15

In a bar chart, the x-axis is labeled with the values of a qualitative variable.

Accepted Answer

A) True 
 B)False

Question 16

A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preference, for example, Democrat, Republican, Libertarian, or another party. The best way to illustrate the frequencies for each political preference is a __________.

Accepted Answer

A)  Bar chart 
B)  Box plot 
C)  Histogram 
D)  Frequency polygon

Question 17

In constructing a frequency polygon, class frequencies are scaled on the ______ axis.

Accepted Answer

The answer of In constructing a frequency polygon, class frequencies...

Question 18

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?"  What percent of the responses indicated that users were somewhat concerned?

Accepted Answer

A)  40% 
B)  70% 
C)  20% 
D)  100%

Question 19

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?

Accepted Answer

A)  60 
B)  31 
C)  91 
D)  46

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 2: Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

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

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

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

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?

The first three class marks for a frequency distribution of "weights of college men" recorded to the nearest pound are 105, 115, and 125. What are the class limits for the fourth class?

When data is collected using a quantitative, ratio variable, what is true about a frequency distribution that summarizes the data?

Ages (rounded to the nearest whole year) of employees at a large company were grouped into a distribution with the following class limits: 20 up to 30 30 up to 40 40 up to 50 50 up to 60 60 up to 70 What is the class interval?

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(n) __________.

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

A frequency distribution for nominal data requires that the categories be _ and ___.

A table summarizing a set of data showing the fraction of the total number of items in several classes is a

In a deck of cards, a class of all cards that are hearts and a class of all cards that are kings are NOT _____________.

Refer to the following distribution: What is the class midpoint for the $45 up to $55 class?

In a bar chart, the x-axis is labeled with the values of a qualitative variable.

In constructing a frequency polygon, class frequencies are scaled on the ______ axis.

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" What percent of the responses indicated that users were somewhat concerned?

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