Question 1

The following frequency distribution shows the distribution of delivery times (in days) for swimstuff.com customer orders during the last month.  How many orders were delivered in less than three days?

Accepted Answer

The answer of The following frequency distribution shows the distribution...

Question 2

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?

Accepted Answer

A) 10 
B) 20 
C) 40 
D) None Apply

Question 3

If the number of observations is 124, calculate the suggested number of classes using the "2 to the k rule."

Accepted Answer

The answer of If the number of observations is 124,...

Question 4

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:

Accepted Answer

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 5

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 6

The relative frequency for a class represents the ________________.

Accepted Answer

A) Class width 
B) Class midpoint 
C) Class interval 
D) Percent of observations in the class

Question 7

A data set has 100 observations. In the data, a quantitative variable's highest value is 117 and its lowest value is 47. What is the minimum class interval that you would recommend?

Accepted Answer

The answer of A data set has 100 observations. In...

Question 8

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?

Accepted Answer

A) A pie chart 
B) A bar chart 
C) A histogram 
D) A frequency polygon

Question 9

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?

Accepted Answer

A) A pie chart 
B) A bar chart 
C) A histogram 
D) A frequency polygon

Question 10

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?

Accepted Answer

A) $50 
B) $100 
C) $150 
D) $200

Question 11

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?

Accepted Answer

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 12

Refer to the following wage breakdown for a garment factory.  What is the class midpoint for the class with the greatest frequency?

Accepted Answer

A) $5.50 
B) $8.50 
C) $11.50 
D) $14.50

Question 13

To calculate a relative frequency, a class frequency is divided by ___________.

Accepted Answer

The answer of To calculate a relative frequency, a class...

Question 14

For a relative frequency distribution, relative frequency is computed as _____________.

Accepted Answer

A) The class width divided by 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 total frequency.

Question 15

Refer to the following breakdown of responses to a survey of room cleanliness in a hotel.  Draw a bar graph that illustrates the preceding frequency table.

Accepted Answer

The answer of Refer to the following breakdown of responses...

Question 16

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 17

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

Accepted Answer

A) 64 and up to 70 
B) 65 and 69 
C) 65 and up to 70 
D) 69.5 and 74.5

Question 18

Refer to the following distribution of commissions:  To plot a cumulative frequency distribution, the first coordinate would be _________.

Accepted Answer

A) X = 0, Y = 600 
B) X = 500, Y = 3 
C) X = 3, Y = 600 
D) X = 600, Y = 0

Question 19

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?

Accepted Answer

A) A pie chart 
B) A bar chart 
C) A histogram 
D) A frequency polygon

Question 20

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

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

The following frequency distribution shows the distribution of delivery times (in days) for swimstuff.com customer orders during the last month. How many orders were delivered in less than three days?

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?

If the number of observations is 124, calculate the suggested number of classes using the "2 to the k rule."

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 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.

The relative frequency for a class represents the ________________.

A data set has 100 observations. In the data, a quantitative variable's highest value is 117 and its lowest value is 47. What is the minimum class interval that you would recommend?

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?

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?

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 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?

Refer to the following wage breakdown for a garment factory. What is the class midpoint for the class with the greatest frequency?

To calculate a relative frequency, a class frequency is divided by ___________.

For a relative frequency distribution, relative frequency is computed as _____________.

Refer to the following breakdown of responses to a survey of room cleanliness in a hotel. Draw a bar graph that illustrates the preceding frequency table.

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?

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

Refer to the following distribution of commissions: To plot a cumulative frequency distribution, the first coordinate would be _________.

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?

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