0 agnet Sham A study was conducted to determine whether magnets are effective at

Question

0 agnet Sham A study was conducted to determine whether magnets are effective at treating back pain. The results are given in the table. Use a 0.05 significance level to test the claim that those treated with magnets pain? have greater reduction in pain x than those given a sham treatment (similar to a placebo). Do not assume the population standard deviations are equal. Does it appear magnets are effective in treating back x 0.54 0.49 0.85 1.02 Click the icon to view the table of critical values. Choose the correct answer below. A. No, because the null hypothesis is not rejected. 0 B. Yes, because the null hypothesis is not rejected. O C. Yes, because the null hypothesis is rejected. 0 D. No, because the null hypothesis is rejected. Click to select your answer.

Explanation / Answer

Here Test Statistic = (0.54-0.49)/Sqrt((0.85*0.85/22)+(1.02*1.02/22)) = 0.1766

Degree of freedom = Min(22-1,22-1) = 21

Critical value in right tailed test at 5% level and df = 21 is 1.7207

So, Option A is correct because null hypothesis is not rejected because test statistic is less than critical value

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