Do students who graduate from high school earn more money than students who do not? To find out, we took a random sample of 371 U.S. residents aged 18 and older. The educational level and total personal income of each person were recorded. The data for the 57 non graduates (No) and the 314 graduates (Yes) are displayed in the relative frequency histograms.

a. Would it be appropriate to use frequency histograms instead of relative frequency histograms in this setting? Explain why or why not.

b. Compare the distributions of total personal income for the two groups.

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60% 50% 40% 30% 20% 10% 0% 60% 50% 40% 30% 20% 10% 0% 20 40 60 80 100 120 140 160 Total personal income ($1000s) High school graduate? Yes ON