(Answered) A coffee shop sells on the average 320 cups of coffee per

Statistics

A coffee shop sells on the average 320 cups of coffee per day, with a standard deviation of 40. After advertising, they find that on 7 days they sell an average of 350 cups.

(a) Has advertising left their business unchanged? Calculate the prob-value.

(b) If the owner of the coffee shop specifies that the type I error of the test (significance level) is to be 5 %, do you reject the hypothesis that business is unchanged?

(d) If coffee sales can be observed for 25 days, what would the average sales have to be in order to justify a statement that business had improved, at the 5 % significance level?

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