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:…

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter1: Functions

Section1.2: The Least Square Line

Problem 8E

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Previous studies have shown that playing video games can increase visual perception abilities on tasks presented in the gaming zone of the screen (within 5 degrees of the center). A graduate student is interested in whether playing video games increases peripheral visual perception abilities or decreases attention to peripheral regions because of focus on the gaming zone. For her study, she selects a random sample of 64 adults. The subjects complete a difficult spatial perception task to determine baseline levels of their abilities. After playing an action video game (a first-person combat simulation) for 1 hour a day over 10 days, they complete the difficult perception task for a second time. Before playing the action video game, the mean score in their accuracy on the spatial task was 0.42. After playing the action video game, the mean score was -0.08. The mean of the differences between each person's pre- and postscores was 0.5, with a standard deviation of the differences equal to…
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