Question: Excel file BagComplaints gives the number of days it took to resolve a random sample of 50 complaints concerning airline baggage handling.

a. Construct a 95% confidence interval estimate of the population mean number of days between receipt of a complaint and resolution of the complaint.

b. Explain the meaning of the interval you constructed in part (a).

c. What sample size would be needed to limit the margin of error to ±5 days with 95% confidence? Use the sample standard deviation rounded to the nearest number of days to estimate the population standard deviation.