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February 27, 2015

February 27, 2015

Posted by **TOM95** on Wednesday, June 19, 2013 at 11:19pm.

n = 21, Óx = 3635.6, and Ó(x - x)2 = 9750.4

(a) Find the sample mean, x.

$ 173.12.

(b) Find the sample standard deviation, s.

$ 22.08 .

(c) Find the 90% confidence interval to estimate the true mean textbook cost for the semester based on this sample.

Lower Limit $

Upper Limit $

I can not get the limits to work out I have tried 4 times and I only have one more time. I have plugged information into calculator that worked on other limits but not this one.

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