The example using the U.S.Census Bureau and income in the text of Chapter 4 was an illustration of

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The example in Chapter 4 using the U.S. Census Bureau and income was used to illustrate the need to use a median instead of a mean when the data is skewed, which is often the case with income data. The median is a better measure of central tendency in skewed data sets because it is not influenced by extreme values.

The Example Using the U