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Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...

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 mu mu 1 mu 2 n 18 18 x overbar 0.55 0.45 s 0.52 1.15

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