Homework Help: statistics

Posted by erica on Friday, May 11, 2012 at 11:51am.

a final exam in statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

statistics - PsyDAG, Friday, May 11, 2012 at 12:44pm
Here you are dealing with means rather than individual scores.

Z = (score-mean)/SEm

SEm = SD/√n

Use same table as indicated in your later post.
statistics - erica, Friday, May 11, 2012 at 1:23pm
where is this formula located on excel?

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