18.40 (EX) Magnets for pain relief 1/5: A randomized, double-blind experiment studied whether magnetic fields applied over a painful area can reduce pain intensity. The subjects were 50volunteers with postpolio syndrome who reported muscular or arthritic pain. The pain level when pressing a painful area was graded subjectively on a scale from 0 to 10 (0 is no pain, 10 ismaximum pain). Patients were randomly assigned to wear either a magnetic device or a placebo device over the painful area for 45 minutes. Here is a summary of the pain scores for thisexperiment, expressed as means ± standard deviations:Magnetic device Place device(n=29)(n=21)Pretreatment 9.6 ± 0.79.5 ± 0.8Posttreatment 4.4 ± 3.18.4 ± 1.81.1 ± 1.6Change5.2 + 3.2Is there good evidence that the magnetic device is better than a placebo equivalent at reducing pain? Let μ₁ and μ₂ be the mean change in pain for patients given the magnetic device orthe placebo device, respectively. State hypotheses for the significant test.O Ho: H1 H2 vs. Ha: 1 = ₂O Ho: H1O Ho: H₁O Ho: H1H2 vs. H₂: H1 H2H₂ VS. H₂ H₁ H₂H2 vs. Ha: H1H₂ 18.40 (EX) Magnets for pain relief 2/5: Give the test statistic, the degrees of freedom and the P-value for the test.Use the conservative method and Table C.O t = 5.95, df = 20, P < 0.0005Ot 1.15, df = 20, 0.2 < P < 0.30O t = 1.15, df = 20, 0.1 < P < 0.15O t= 5.95, df = 20, P > 0.001

Answered: 8.40 (EX) Magnets for pain relief 1/5:…

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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