Homework Help: college

Posted by bjacobs on Wednesday, February 16, 2011 at 8:39am.

Find the 90% confidence interval for the variance and the standard deviation of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2,3 years. Assume the variable is normally distribution

college - Writeacher, Wednesday, February 16, 2011 at 8:40am
Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.
statistics - PsyDAG, Wednesday, February 16, 2011 at 10:37am
ą 1.645 SEm

Standard Error of the mean = SEm = SD/√(n-1)

That is for a distribution of means.

For a distribution of scores

ą 1.645 SD
college - Andrea, Wednesday, May 25, 2011 at 1:36am
Given that the distance from the earth to the sun is 1.5 times 10 to the power m and the

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