A test was taken by 90 students. A random sample of 10 scores found the following results: 93 71 62 75 81 63 87 59 84 72 a. Find a 90% confidence interval for the population’s mean score. b. Without...

A test was taken by 90 students. A random sample of 10 scores found the following results:



93  71  62  75  81  63  87  59  84  72


a. Find a 90% confidence interval for the population’s mean score.

b. Without doing the calculations, state whether a 95% confidence interval for the population mean would be wider or narrower than the interval found in part a.