GIven confidence level,11.24<u<12.01 and that n=90 + c= .90, find the sample standard devaiton o

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- Jul 19th 2008, 07:30 PMkscheelsfinding standard deviation ?
GIven confidence level,11.24<u<12.01 and that n=90 + c= .90, find the sample standard devaiton o

- Jul 19th 2008, 07:31 PMkscheels
[quote=kscheels;168572]GIven confidence level,11.24<u<12.01 and that n=90 + c= .90, find the sample standard devaiton o.

- Jul 19th 2008, 09:35 PMmr fantastic
I'm assuming that since you ask for

*sample*standard deviation rather than*population*standard deviation, the confidence interval has been constructed using the t-distribution:

Therefore .

In your case (I think ..... it's not really clear from what you posted), n = 90, and . Use a table of critical values to get .

Substitute all these values and solve for s.