Question 1

What are the class limits for the $55 up to $65 class? 
A) 55 and 64
B) 54 and 64
C) 55 and up to 65
D) 55 and 64.5

Accepted Answer

55 and up to 65

Question 2

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

Accepted Answer

To avoid a large number of empty classes

Question 3

When a class interval is expressed as: 100 to under 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.

Accepted Answer

Observations with values of 200 are excluded from the class frequency.

Question 4

The chart below can be best described as 
A) Frequency Polygon
B) Bar chart
C) Pie chart
D) Stacked bar chart
E) Cumulative stacked bar chart

Accepted Answer

Bar chart

Question 5

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

Accepted Answer

50

Question 6

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

Accepted Answer

Frequency distribution

Question 7

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 $14.00
C) $11.75 and $14.25
D) $12.00 and $15.00

Accepted Answer

$12.00 and $15.00

Question 8

The following class intervals for a frequency distribution were developed to provide information
Regarding the starting salaries for students graduating from a particular school: 
Before data was collected, someone questioned the validity of this arrangement. Which of the
Following represents a problem with this set of intervals?
A) there are too many intervals
B) the class widths are too small
C) some numbers between 18,000 and 30,000 would fall into two different intervals
D) the ﬁrst and the second interval overlap

Accepted Answer

some numbers between 18,000 and 30,000 would fall into two different intervals

Question 9

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

Accepted Answer

65 and 70

Question 10

Refer to the following price of jeans are recorded to the nearest dollar:
The ﬁrst two class midpoints are $62.50 and $65.50.
What is the class interval?
A) $1.00
B) $2.00
C) $2.50
D) $3.00

Accepted Answer

$3.00

Question 11

What is the relative frequency for those salespersons that earn between $1,600 and $1,799?
A) 2%
B) 2.4%
C) 20%
D) 24%

Accepted Answer

20%

Question 12

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

Accepted Answer

Class frequency

Question 13

Refer to the following price of jeans are recorded to the nearest dollar:
The ﬁrst two class midpoints are $62.50 and $65.50.
What are the class limits for the third class?
A) $64 and $67
B) $67 and $69
C) $67 and $70
D) $66 and $68

Accepted Answer

$67 and $70

Question 14

A group of 100 students were surveyed about their interest in a new International Studies program.
The survey asked students about their interest in the program in terms of high, medium, or low. 30
Students responded high interest; 50 students responded medium interest; 20 students responded
Low interest. What is the relative frequency of students with low interest?
A) 30%
B) 50%
C) 20%
D) Cannot be determined.

Accepted Answer

20%

Question 15

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

Accepted Answer

$100

Question 16

Refer to the following price of jeans are recorded to the nearest dollar:
The ﬁrst two class midpoints are $62.50 and $65.50.
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

Accepted Answer

$61 and up to $64

Question 17

Consider the following relative frequency distribution:  If there are 2,000 numbers in the data set, how many of the values are less than 30?
A) 900
B) 90
C) 1900
D) 100

Accepted Answer

1900

Question 18

The following class intervals for a frequency distribution were developed to provide information
Regarding the starting salaries for students graduating from a particular school: 
Before data was collected, someone questioned the validity of this arrangement. Which of the
Following represents a problem with this set of intervals?
A) there are too many intervals
B) the class widths are too small
C) some numbers between 18,000 and 30,000 would not fall into any of these intervals
D) the ﬁrst and the second intervals overlap
E) the second and third intervals overlap

Accepted Answer

the second and third intervals overlap

Question 19

Refer to the following ages (rounded to the nearest whole year) of employees at a large company
That were grouped into a distribution with 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 and the midpoint of the ﬁrst class?
A) 20 and 25
B) 20 and 24.5
C) 10 and 25
D) 10 and 24.5

Accepted Answer

10 and 25

Question 20

The head of the statistics department wants to determine the number of mistake made by students
In their ﬁrst online assignment. She gathers information from her classes of the past year. 
The approximate range (distance from the minimum value in the raw data up to the maximum value)
Of the data is _________.
A) 150
B) 40
C) 10
D) 2

Accepted Answer

10

Quiz 2: Describing Data: Frequencydistributions and Graphic Presentation

What are the class limits for the $55 up to $65 class?

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

When a class interval is expressed as: 100 to under 200

The chart below can be best described as

What is the class midpoint for the $45 up to $55 class?

What is the following table called?

A sample distribution of hourly earnings in Paul's Cookie Factory is: The limits of the class with the smallest frequency are:

For the following distribution of heights, what are the limits for the class with the greatest Frequency?

Refer to the following price of jeans are recorded to the nearest dollar: The ﬁrst two class midpoints are $62.50 and $65.50. What is the class interval?

What is the relative frequency for those salespersons that earn between $1,600 and $1,799?

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

Refer to the following price of jeans are recorded to the nearest dollar: The ﬁrst two class midpoints are $62.50 and $65.50. What are the class limits for the third class?

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?

Refer to the following price of jeans are recorded to the nearest dollar: The ﬁrst two class midpoints are $62.50 and $65.50. What are the class limits for the lowest class?

Consider the following relative frequency distribution: If there are 2,000 numbers in the data set, how many of the values are less than 30?

Refer to the following ages (rounded to the nearest whole year) of employees at a large company That were grouped into a distribution with 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 and the midpoint of the ﬁrst class?