# SOLUTION: With the sample mean in Problem 9, find (a) the 95% confidence interval and (b) the 99% confidence interval.

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: With the sample mean in Problem 9, find (a) the 95% confidence interval and (b) the 99% confidence interval.      Log On

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 Click here to see ALL problems on Probability-and-statistics Question 85489This question is from textbook elementary statistics in social research : With the sample mean in Problem 9, find (a) the 95% confidence interval and (b) the 99% confidence interval.This question is from textbook elementary statistics in social research Answer by stanbon(57307)   (Show Source): You can put this solution on YOUR website!With the sample mean in Problem 9, find (a) the 95% confidence interval and (b) the 99% confidence interval. --------- I don't have the text but, if your sample mean is x-bar, a) the 95% CI is x-bar-1.96[sigma/sqrt(n)] < mu < x-bar+1.96[sigma/sqrt(n)] b) the 99% CI uses 2.576 in place of 1.96 ==================== Cheers, Stan H.