Question
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?
Answers
PsyDAG
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.
Z = (score-mean)/SEm
SEm = SD/√n
Use same table as indicated in your later post.
erica
where is this formula located on excel?