Magnet Treatment of Pain Researchers conducted a study to determine whether magnets are effective in treating back pain, with results given below (based on data from €œBipolar Permanent Magnets for the Treatment of Chronic Lower Back Pain: The values represent measurements of pain using the visual analog scale. Use a 0.05 significance level to test the claim that those given a sham treatment (similar to a placebo) have pain reductions that vary more than the pain reductions for those treated with magnets.

Assume that both samples are independent simple random samples from populations having normal distributions.

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Reduction in Pain Level After Sharn Treatment: n = 20, x = 0.44, s = 1.4 Reduction in Pain Level After Magnet Treatment: n = 20, x = 0.49, s 0.96