Question: A test was taken by 90 students. A random sample of ten scores found the following re- sults: 93 71 62 75 81 63 87

A test was taken by 90 students. A random sample of ten scores found the following re- sults: 93 71 62 75 81 63 87 59 84 72

(a) Find a 90% confidence interval for the population mean score.

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

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