Chapter 2 Quiz
Refer to the following distribution of ages: AGES / NUMBER 40 up to 50 / 10 50 up to 60 / 28 60 up to 70 / 12 What is the class interval?
10
Refer to the following breakdown of responses to a survey of room service in a hotel. RESPONSE / FREQUENCY Not satisfied / 20 Satisfied / 40 Highly satisfied / 60 What type of chart should be used to describe the frequency table?
Bar chart
To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the number of classes. T / F
False
What is the following table called? AGES / NUMBER OF AGES 20 up to 30 / 16 30 up to 40 / 25 40 up to 50 / 51 50 up to 60 / 80 60 up to 70 / 20 70 up to 80 / 8
Frequency distribution
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 other party. The best way to illustrate the relative frequency distribution is a
Pie chart
Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet"? RESPONSE / FREQUENCY Very concerned / 140 Somewhat concerned / 40 No concern / 20 What type of chart should be used to show relative class frequencies?
Pie chart
Why are unequal class intervals sometimes used in a frequency distribution?
To avoid a large number of empty classes
A pie chart is similar to a relative frequency distribution. T / F
True
In a bar chart, the heights of the bars represent the frequencies in each class. T / F
True
In a bar chart, the x-axis is labeled with the values of a qualitative variable. T / F
True
The midpoint of a class, which is also called a class mark, is halfway between the lower and upper limits. T / F
True
To construct a pie chart, relative class frequencies are used to graph the "slices" of the pie. T / F
True
To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the sum of the class frequencies. T / F
True
A pie chart shows the
relative frequencies of a qualitative variable.
