Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for thetreatment (with magnets) qroup and the sham (or placebo) group. The results are a measure of reduction in back pain. Assume that the twOsamples are independent simple random samples selected from normally distributed populations, and do not assume that the populationstandard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both parts.1010n0.510.410.971.18O C. Ho H2D. Ho 2The test statistic, t, is(Round to two decimal places as needed.)

(a)To test whether the treatment is effective, the following null and alternative hypotheses are…

Answered: Researchers conducted a study to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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People spend huge sums of money for the purchase of magnets used to treat a wide variety of pains. Researchers conducted a study to determine whether magnets are effective in treating back pain. Pain was measured using the visual analog scale, and the results given below are among the results obtained in the study. Assume that population variances are equal and unknown, use a = 0.05 to test the claim that those treated with magnets have a greater reduction in pain than those given a sham treatment. Find the value of the statistic. Reduction in sample sample sample pain level after magnet treatment size mean std. dev. nį = 20 | ī = 0.49 n2 = 20 | ã2 = 0.44 S1 = 0.96 S2 = 1.4 after sham treatment
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A random sample of 16 statistics examinations from a large population was taken. The average score in the sample was 78.6 with a sample variance of 64. We are interested in determining whether the average grade of the population is significantly more than 75. Assume the distribution of the population of grades is normal. The value of the test statistic is 1.80 O b. 3.6 С. 0.45 2.

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