Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 52

Basic Computation: Confidence Interval Suppose x has a mound-shaped distribution with = 9. A random sample of size 36 has sample mean 20.
(a) Check Requirements Is it appropriate to use a normal distribution to compute a confidence interval for the population mean Explain.
(b) Find a 95% confidence interval for .
(c) Interpretation Explain the meaning of the confidence interval you computed.