Payment times of 100 randomly selected cus- tomers this

Payment times of 100 randomly selected cus- tomers this month had an average of 35 days. The standard deviation from this group was 2 days.

a. Build a 90% two-sided confidence interval on the mean payment time."

b. Build a 99% two-sided confidence interval on the mean payment time.

c. Is it possible that the average time is 30 days?"

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Payment times of 100 randomly selected cus- tomers this : payment times of 100 randomly selected cus- tomers this month had an average of 35 days. the standard deviation from

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