Key Fact 7 - Montgomery College

a) Compute the 90% confidence interval about µ if the sample size, n, is 45. (Use the closest degrees of freedom that is smaller than 45) 59.2 ± .9539 → (58.25, 60.15) For calculator feature use STAT, arrow to TESTS, and select 8:TInterval, select Stats enter the required information, and CALCULATE. b) Compare with your answer to part 1-a. ................
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