Refer to the previous exercise. Suppose that the change in weight scores for the 132 freshmen had
Question:
a. Explain how this standard deviation could be so much less than the standard deviation of 30 for the weight scores at each time.
b. Is 15 pounds a plausible mean weight change in the population of freshman women? Answer by constructing a 95% confidence interval for the population mean change in weight or conducting a significance test of the hypothesis that the mean weight change in the population equals 15. Interpret.
c. What assumptions are necessary for the inference in part b?
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a The standard deviation of the change in weight scores could be much smaller because eve...View the full answer
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Related Book For 
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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