Payment times of 100 randomly selected customers this month had
Payment times of 100 randomly selected customers 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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