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

Question:

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.