A simple random sample of 50 item from a population with = 6 result in a

A simple random sample of 50 item from a population with σ = 6 result in a Sample mean of 32.

a. Construct a 90 per cent confidence interval for the population mean µ.

b. Construct a 95 per cent confidence interval for µ.

c. Construct a 99 per cent confidence interval for µ.

A survey of 750 university students found they were paying on average €108 per week in accommodation costs. Assume the population standard deviation for weekly accommodation costs is €22.

a. Construct a 90 percent confidence interval estimate of the population mean µ.

b. Construct a 95 percent confidence interval estimate of µ.

c. Construct a 99 percent confidence interval estimate of µ.

d. Discuss what happens to the width of the confidence interval as the confidence level is increased. Does this result seem reasonable? Explain.

Answer rating: 100% (QA)

Mean 32 sd 6 and n 50 a zvalue for 90 CI is 1645 ME 16456sqrt50 13958 ... View the full answer