The president of Blitz Sales Enterprises sells kitchen products through television commercials, often called infomercials. He gathered data from the last 15 weeks of sales to determine the relationship between sales and the number of infomercials.

a. Determine the regression equation. Are the sales predictable from the number of commercials?
b. Determine the residuals and plot a histogram. Does the normality assumption seemreasonable?

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Infomercials Sales ($000s) Infomercials 20 15 25 10 18 18 15 12 Sales ($000s) 3.2 2.6 3.4 1.8 2.2 2.4 2.4 2.5 2.4 3.0 2.7 2.0 2.6 2.8 15 25 16 20 25