Posted by Anonymous on Tuesday, February 14, 2012 at 9:37pm.
Your question is not clear.
How are you going to determine IQ level of the 20 persons? Would this relate to your inquiry?
Ho: mean = 100
Ha: mean > 100
If mean IQ = 100 and SD = 15 (as in WISC and WAIS):
Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.
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