Question

This Question: 1 pt 20 of 35 (12 complete) This Test: 104 pts possible Question Help Treatment Sham determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The samples selected from nomally distributed populations, and do not assume that the population Researchers conducted a study 17 17 standard devlations are equal Comolete narts (al and (b) helow Use a 0 05 sianlficance level for both.narts 0.54 137 a. Test the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment. What are the null and alternative hypotheses? O A. Ha: H H2 H 2 O B. Ho: H#2 H HH2 OD. Ho: H1H2 O C. Ho: H<H2 Hi: 2 (Round to two decimal places as needed.) The test statistic, t, is The P-value is (Round to three decimal places as needed.) State the conclusion for the test. the null hypothesis. There sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than those given sham treatment. Is it valid to argue that magnets might appear to be effective if the sample sizes are larger? valid to argue that magnets might appear to be effective if the sample sizes are larger those treated with magnets is Since the the sample mean for those given a sham treatment, it b. Construct a confidence interval suitable for testing the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.

Answer 1

Ca) NuL AND ALTERNATIVE AOTHESIS Ansarer Be cause ule Aypotheis altarnatue toceatment 2 botA toreatmenty are he asum dame and hypothedid treat.ent n beller Note Loceatmant I magnet beealment Shom 2 (b) taliste 2- 2. . tinder - O41-0.24 37 17 O2916 18 769 (o.03-0.024) t - O.3571 tutzo t o.o168 1706 Tabuloted t values O.o168 Calculated t value ereadly ffeclive belh asce We accept Ho ie pvalue he need to conider probabilly 0-o168 greater than oo168 No check probabildy capending hhich hich is 9&clale to too.o168 ie oGo greealorr than sigfanes value

Apporox pvaluo 0.6 So e accapt M Conclusion, under Nul0 Aypo, Thasre suffeceren Somplemean tvesocl Hhose toreatad dl magnal d eual not valad to argr Since the the ample Hat magnals st mean Soon (b Confidencs terval t tae (008-0014)Ho O163) fo s5 (o 3571) (o03-0014) O.0168 O-01199 7-2X10 (72X160 01199) C I s