1. Chapter 2: Descriptive Statistics, Tabular and Graphical
Chapter 2A
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Chapter 2: Descriptive Statistics, Tabular and Graphical
Fall 2000

2. Chapter 2A
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I. Qualitative Data
Because of the nature of qualitative data, most methods of description rely upon groupings of data that share common characteristics.
Fall 2000

3. A. Frequency Distribution
Chapter 2A
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A. Frequency Distribution
This is a tabular summary of a set of data showing the frequency (or number) of items in each of several non-overlapping classes.
Example: Suppose we have a class of 12 students and we ask them to indicate their home state. Our sample size is n=12.
Fall 2000

4. A sample frequency distribution.
Chapter 2A
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A sample frequency distribution.
4 say they’re from Indiana.
3 say they’re from Kentucky.
2 are from Ohio.
2 are from Michigan.
1 is from the great state of Oregon.
Fall 2000

5. B. Relative Frequency.
This is simply the proportion of the total number of data items in each class.
To calculate the relative frequency of a class,

6. A sample relative frequency distribution.

7. C. Bar Graphs and Pie Charts
These tools are just ways in which to communicate a summary of the data to your audience.

8. Chapter 2A
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Fall 2000