Posted by bjacobs on .
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,
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,
± 1.645 SEm
Standard Error of the mean = SEm = SD/√(n1)
That is for a distribution of means.
For a distribution of scores
± 1.645 SD 
college 
Andrea,
Given that the distance from the earth to the sun is 1.5 times 10 to the power m and the