college
posted by bjacobs .
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

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± 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 
Given that the distance from the earth to the sun is 1.5 times 10 to the power m and the