Chapter 2: Graphs, Charts, and Tables--Describing Your Data
Chapter 2: Graphs, Charts, and Tables--Describing Your Data
Chapter 2: Graphs, Charts, and Tables--Describing Your Data
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64 CHAPTER 2 • GRAPHS, CHARTS, AND TABLES—DESCRIBING YOUR DATA<br />
SUMMARY Constructing Pie <strong>Charts</strong><br />
A pie chart is constructed using the following steps:<br />
1. Define the categories for the variable of interest.<br />
2. For each category, determine the appropriate measure<br />
or value. The value assigned to each category is the<br />
proportion the category is to the total for all categories.<br />
3. Construct the pie chart by displaying one slice for each<br />
category that is proportional in size to the proportion the<br />
category value is to the total of all categories.<br />
EXAMPLE 2-8 Pie <strong>Charts</strong><br />
Gold Equipment A survey was recently conducted of 300 golfers that asked questions<br />
about the impact of new technology on the game. One question asked the golfers to<br />
indicate which area of golf equipment is most responsible for improving an amateur<br />
golfer’s game. The following data were obtained:<br />
TRY PROBLEM 2.28<br />
Equipment<br />
Frequency<br />
Golf Ball 81<br />
Club Head Material 66<br />
Shaft Material 63<br />
Club Head Size 63<br />
Shaft Length 3<br />
Don’t Know 24<br />
To display these data in pie chart form, use the following steps:<br />
Step 1 Define the categories.<br />
The categories are the six equipment-response categories.<br />
Step 2 Determine the appropriate measure.<br />
The appropriate measure is the proportion of the golfers surveyed. The<br />
proportion for each category is determined by dividing the number of<br />
Club Head Size<br />
21%<br />
Don’t Know<br />
8%<br />
Shaft Length<br />
1%<br />
Golf Equipment Impact<br />
Golf Ball<br />
27%<br />
Shaft Material<br />
21%<br />
Club Head Material<br />
22%