The graph shown in Example 2(a) is called a scatter plot. A scatter plot is very useful in detecting patterns in data. You can use a spreadsheet to create a scatter plot similar to the one in Example 2(a) using the steps below.
- Create a spreadsheet like the one shown.
- Select cells A2 through A20 and B2 through B20.
- From the Insert menu, choose Chart....
- Select the Standard Types tab. Under Chart type:, select XY (Scatter). Then click Next.
- Click Next again.
- Select the Titles tab. Enter "U.S. Men's Shoe Size" for Chart title:, "Foot length (inches)" for Value (X) axis:, and "Shoe size" for Value (Y) axis:.
- Select the Legend tab. Uncheck Show legend. Click Finish.
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The data for this checkpoint is located in the spreadsheet.
- Each time the foot length changes by 0.17 inches, the shoe size increases by half a size. So the pattern is linear.
- Using the spreadsheet to graph the data, you can see that the points on the graph lie on a line. So the graph is linear.
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