6.2.8. Calcula te the P-values for the hypcthesis tests indicated in Question 6.2.1. Do they agree with your decisions on whether or not to rejecl Ho?
6.2.9. Suppose Ho: µ.= 120 is tested against H1:µ -¢-. 120. If a = 10 and n = 16, what P-value
is associated with the sampJe mean ji == 122.3? Under what circumstances will Ho be
6.2..10. As a class research project, Ros.aul1bwants to see whether the stress of final exams elevates the blood pressures of freshmen women. When they are not under any untoward duress, healthy 18-year-old women have systolic blood pressures that average 120 mm Hg with a standard deviation of 12 mm Hg. [f Rosaura finds th.at the average blood pres.sure for Lhe 50 women in Statistics 101 on the day of the final exam is 125.2, what should she conclude? Set up and test an appropriate hypothesis.
6.2.11. As input for a new inflatioo model, economists predicted that the average cost of a hypcthetical "food basket" in east Tennessee in July would be $145.75. The standard deviation (a) of basket prices was assumed to be $9.50, a figure tha t has held fairly constant over the years. To check their prediction, a sample of 25 haskets representing different parts of the region were checked in late July, and the average cost was $149.75. Let a = 0.05. ls the difference between the economists' prediction and the sample mean
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