According to the National Health Statistics Reports, thestandard deviation of the weights of all one-year-old baby boysborn in the U.S. is 5.3 pounds. A random sample of 360 one-year-oldbaby boys born in the U.S. had a mean weight of 25.5 pounds.
a) Construct a 90% confidence interval for the mean weight of allone-year-old baby boys in the U.S. Write a sentence that interpretsthis interval.
b) Should this confidence interval be used to estimate the meanweights of all one-year-old babies in the U.S.? Explain.
