STAT 200 Week 5 HomeworkSolution Correct AnswersLane Chap. 1010. The effectiveness of a blood-pressure drug is being investigated. How might anexperimenter demonstrate that, on average, the reduction in systolic blood pressure is 20 ormore?12. A person claims to be able to predict the outcome offlipping a coin. This person iscorrect 16/25 times. Compute the 95% confidence interval on the proportion of times thisperson can predict coinflips correctly. What conclusion can you draw about this test of hisability to predict the future?15. You take a sample of 22 from a population of test scores, and the mean of your sampleis 60.(a) You know the standard deviation of the population is 10. What is the 99% confidenceinterval on the population mean.(b) Now assume that you do not know the population standard deviation, but the standarddeviation in your sample is 10. What is the 99% confidence interval on the mean now?18. You were interested in how long the average psychology major at your college studiesper night, so you asked 10 psychology majors to tell you the amount they study. They toldyou the following times: 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4.(a) Find the 95% confidence interval on the population mean. (b) Find the 90% confidenceinterval on the population mean.Illowsky Chap. 8Preview Mode
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