Chapter 2: Descriptive Statistics: Tabular and Graphical Methods

You are given the following frequency of grades for a Business Statistics class:

What is the relative frequency of the D grade?
1. 0.07
2. 0.14
3. 7
4. 14
5. 50.4
You are given the following frequency of grades for a Business Statistics class:

What is the relative frequency of the B grade?
1. 0.15
2. 0.30
3. 30
4. 108
5. None of the above
You are given the following frequency of grades for a Business Statistics class:

When constructing a pie chart, how many degrees would be in the section of the pie showing the F grade?
1. 0.06
2. 6
3. 21.6
4. None of the above
A bar graph is appropriate when summarizing
1. quantitative data
2. qualitative data
A histogram is appropriate when summarizing
1. quantitative data
2. qualitative data
Define ogive.
1. A percent frequency distribution.
2. A graph of a cumulative distribution.
3. A tabular summary of data for two variables
4. The beginning of the song "Home on the Range".
Read left to right, an ogive can never decrease.
1. True
2. False
A sample of ten price/earnings ratios for companies in the Services sector follows.
37 11 14 17 12 21 24 17 28 30
If a stem-and leaf display were constructed for this sample, how many leaves would there be for the "3" stem?
1. 0
2. 1
3. 2
4. 3
The last entry in a cumulative relative frequency distribution is always one.
1. True
2. False
To summarize two variables simultaneously, one could use which of the following?
1. Crosstabulation
2. An ogive
3. A scatter diagram
4. Either a or c
5. None of the above
When using crosstabulation, both variables must be quantitative.
1. True
2. False
When using a scatter diagram, both variables must be quantitative.
1. True
2. False
If a scatter diagram shows a negative relation then, in general, as
1. x increases, y increases
2. y increases, x increases
3. x increases, y decreases
4. None of the above
If you were to summarize the birth month (January, February, March, ...) of the students in your dorm, which method would be appropriate?
1. An ogive
2. A stem-and-leaf display
3. A bar graph
4. None of the above
You would like to compare students' grades (A, B, C, D, F) in an Economics class to their grades in a Statistics class. Which method would be appropriate?
1. Crosstabulation
2. A bar graph
3. A dot plot