Question: With reference to Exercise 11.9 on page 419, construct 1. a 95% confidence interval for the average weekly sales when $45 is spent on advertising;

With reference to Exercise 11.9 on page 419, construct 1. a 95% confidence interval for the average weekly sales when

$45 is spent on advertising;

2. a 95% prediction interval for the weekly sales when $45 is spent on advertising.

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