CHAPTER 3
Descriptive Statistics
Chapter Outline
The Murder Capital of Massachusetts
And that’s the news from Lake Wobegon, where all the women are strong, all the men are good-looking, and all the children are above-average.
—Garrison Keillor
Chapter 2 explained how graphs help us understand data by identifying typical values, outliers, variations, trends, and correlations. For formal statistical inference, we need to work with precise numerical measures. It is not enough to say “It looks like output and unemployment are inversely related.” We want to measure the ...
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