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
± 1.645 SEm

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

That is for a distribution of means.

For a distribution of scores

± 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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