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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 0.05significance level for both parts.

Treatment

Sham

muμ

mu 1μ1

mu 2μ2

n

1414

1414

x overbarx

0.540.54

0.440.44

s

0.730.73

1.041.04
Math   Statistics-And-Probability   
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