Question

question #24

313 7-1 Estimating a Population Proportion <p 174% sult from part (a)tothis 95% onfidence iterval for 5 subjects who she 45 sutycts given a placebo instead of OyContin: 1.93% < ρ a. developed y When she was 9 years of age, Emily Rosa did a science fair experimem sed professional souch therapists to see if they could sense her energy fieldhe be tn select either her right hand or her left hand, and then she asked the therapist ecsed hand by placing their hand just under Emily's hand without seeing i ueching Chose Look ar Therapeusic Touch." Jourmal of the American Medical Assoctanion 0es 056 is. Among 280 trials, the touch theragists were correct 123 times (baso of the Emily used a coin toss to select either her right hand or her left hand, what pro- sorrect responses would be expected if the touch therapiss made random guesses s sample results, what is the best point estimate of the therapists success rate? ouch therigsts realy had had 33 hand by sensing an energy feld ther success tate would be significantly greater than 0.5, but the sample sucoess rate of 0.439 and the confidence ierval sug Exmily' ly's sample results, construct 99% oonidence interval estimate of the proportion Jo he results suggest about the ability of touch therapists to select the corect hand by them used at least one prescription medication (based on data from Use ia the United States," by Qato et al., Journal of the American Medical Association. tienes made by touch therapists st that they do not vetho ability to select the correct hand by sensing an energy tiekd erval energy cation Usage In a survey of 3005 adults aged 57 through 85 years, it was 1.7 of t n and Over-the-Counter Medications and Dietary Supplements Among Older Ncthing ings-135.00270% < p its ou No. 24) nany of the 3005 subjects used at least one prescription medication? , because 00340% s nouded b. n the confidence inteval (Table 0.666 < in the conidence interval, it do educt a 90% confidence interval estimate of the percentage of adults aged 57 through whur do the results tell us about the proportion of college students wbo use at least one pre- Cell Phones and Cancer A study of 420095 Danish cell phone users found that 003 21% 2, 0666 <p t least one prescription medication. 0734) b. No. Because 0.61 is not incuö n medication? not appear that the responses are consistent with the achal em developed cancer of the brain or nervous system. Prior to this study of cell phone use, voher tumout 25. Placebo 004 0.697% of such cancer was found to be 00340% for those not using cell phones. The data are p fum the Journal of the National Cancer Institute , le de sample data to construct a 90% confidence interval estimate of the percentage of ail phone users who develop cancer of the brain or nervous system. 4 49% Treatment goo: O 268 p< 1.57%. Because the ho confidence intervals overtap, t does not appear to be a sign difterence between the rates aliergic reactions Alergic re do not appear to be a conce a Do cell phone users appear to have a rate of cancer of the brain or nervous system that is dif- hot of ech cancer amone those not usine cell nhone Wh 24. Naruers wno Say They voted in a survey of 1002 people, 70% said that they voted in aracent presidential election (based on data from ICR Research Group). Voting records show Lipitor users 6. XSORT: 91.4% < < 94 VSORT 77.7% < p < 86 The two confidence intera overlap. it appears that h rate for the XSORT methw than the success rate to method, but the big sto hat the XSORT method YSORT method both a tar 61% of eligible voters actually did vote. Fada 98% confidence interval estimate of the proportion of people who say that they voted. unter mmout of 61%2 why or why not? 28 Lipitor In clinical trials of the drug Lipitor (atorvastatin), 270 subjects were given a pla- acho and 7 of them had allergic reactions. Among 863 subjects treated with 10 mg of the drug. experienced allergic reactions. Construct the two 95% confidence interval estimates of the very efective becaus percentages of allergic reactions. Compare the results. What do you conclude? rates are well above t Gender Selection Before its clinical trials were discontinued, the Genetics & IVF Insti- e conducted a clinical trial of the XSORT method designed to increase the probability of expected with no tre onceiving a girl and, among the 945 babies born to parents using the XSORT method, there continued

Answer 1

Centhal himit ThueremStnce he nase r2 = 0.61 bpuobontem o intexwal imdsridu als who vstedie , (나) O.02 (aa)(0-39) Z 0.61 + 100 2 (2-33)一10.000 2374 0-61 = 0.61と0.0359 0.50.659