Posted by Anonymous on Sunday, September 1, 2013 at 12:25am.
7) 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, Sunday, September 1, 2013 at 1:55pm
Z = (scoremean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

statistics  Linda, Sunday, March 16, 2014 at 8:47pm
(7.73/SQRT (24) = 1.577879643, next we subtract the data value (70) from the mean (73) as follows (70 – 73 = 3); the values of the two equations are divided as follows (3/1.577879643 = 1.901285699).
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