Our sample mean is 20.467 . Our sample standard deviation is 11.898. For the two-sided interval, we want +/- 1.96 standard deviations from the mean. That is, we want (-2.853 ,43.787). For a one-sided interval, we want z score 1.645. That is, we get (-infinity, 40.039) and (0.895, infinity)
Apr 22nd, 2015
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