Homework Help: Statistics

Posted by anonymous on Monday, August 2, 2010 at 12:00am.

a score of 10 indicates severe depression, while a score of 0 indicates no depression. From reports, she is able to find out about past testing. Fourth graders at her school usually score 5 on the scale, but the variation is not known. Her sample of 20 fiftsh graders has a mean depression score of 4.4.
The counselor calculates the unbiased estimate of the population's variance to be 15. What is the variance of the distribution of means?

Statistics - PsyDAG, Monday, August 2, 2010 at 11:14am
Standard error of mean = Standard deviation/√(n-1)

SD^2 = Variance

Variance of mean = 4.4/19 = ?

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