Question

Researchers conducted a study to 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 results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.05 significance level for both parts. Treatment Sham u u1 u2 n 14 14 x 0.49 0.37 s 0.86 1.12 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? B. The test statistic, t, is ______________ ​(Round to two decimal places as​ needed.) C. The P-value is ___________ ​(Round to three decimal places as​ needed.)

Answer 1