Question: With reference to Exercise 11.9 on page 399, construct (a) a 95% confidence interval for the average weekly sales when $45 is spent on advertising;

With reference to Exercise 11.9 on page 399, construct

(a) a 95% confidence interval for the average weekly sales when $45 is spent on advertising;

(b) a 95% prediction interval for the weekly sales when

$45 is spent on advertising.

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