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April 18, 2015

April 18, 2015

Posted by **tom9** on Friday, June 21, 2013 at 9:17pm.

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 $164.30 .

Upper Limit $ 181.94

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