How much of a standard deviation did the discrepancy between X and hyp amount to?
A researcher drew a sample of 400 people, measured their IQs, and tested the null hypothesis that ?IQ = 100. The researcher obtained z 3.00, which led her to reject the hypothesis ( was 15.0). (a) What was the standard error of the mean? (b) What was the mean of the sample? (c) The test yielded a statistically significant outcome. Does it appear to be an important one? Explain. (d) How much of a standard deviation did the discrepancy between X and hyp amount to?
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