BSC 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 “Bipolar Permanent Magnets for the Treatment of Chronic Lower Back Pain: A Pilot Study,” by Collacott, Zimmerman, White, and Rindon Journal of the American Medical Association,Vol. 283, No. 10). 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. Reduction in Pain Level After Sham Treatment: n= 20, x= 0.44,s =1.4 Reduction in Pain Level After Magnet Treatment: n= 20, x= 0.49,s =0.96

Solution 11 BSC Step 1 The given problem explain about Magnet treatment. From the given information we know that we want to test the claim that those given a sham treatment have pain reductions that vary more than the pain reductions for those treated with magnets. Here, first sample is sham treatment because its standard deviation is larger and second sample is magnet treatment. Then hypothesis is H 0 =1 2 H 1 > 1 2 Where and are the variance of population. 1 2 Then the given data is Reduction in pain level after n1=20 Sham treatment : x1= 0.44 s =1.4 1 Magnet treatment : n 220 x 20.49 s2=0.96