Researchers conducted a study to determine whether magnets are effective in treating back pan. Pain was measured using the visual analog scale , and the results shown below are among the results obtained in the study. Higher scores correspond to greater pain levels . 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) to (b) below . Reduction in Pan Level After Magnet Treatment (mu_{1}) / n = 27x = 0.48 , s = 0.92. Reduction in Pan Level After Sham Treatment (H_{2}) * n = 27 , x = 0.39 , s = 1.4