Problem 4. A randomized experiment studied whether magnetic fields applied over a painful area can reduce pain intensity. The subjects are 54 volunteers 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 and 10 is maximum 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 this experiment, expressed as sample means + sample standard deviations: Magnetic device Placebo device n2 = 25 9.5±0.8 8.4土1.8 1.1+1.6 Pre-treatment Post-treatment n1 = 29 9.6±0.7 4.4+3.1 Change 5.2+3.2 Post/Share (1). Is there any evidence that the magnetic device is better than a placebo device in terms of reducing pain at the significance level a = 0,05?

Problem 4. A randomized experiment studied whether magnetic fields applied over a painful area can reduce pain intensity. The subjects are 54 volunteers 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 and 10 is maximum 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 this experiment, expressed as sample means + sample standard deviations: Magnetic device Placebo device n2 = 25 9.5±0.8 8.4土1.8 1.1+1.6 Pre-treatment Post-treatment n1 = 29 9.6±0.7 4.4+3.1 Change 5.2+3.2 Post/Share (1). Is there any evidence that the magnetic device is better than a placebo device in terms of reducing pain at the significance level a = 0,05?

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Description: Thank you Problem 4. A randomized experiment studied whether magnetic fields applied over a painfularea can reduce pain intensity. The subjects are 54 volunteers with postpolio syndrome whoreported muscular or arthritic pain. The pain level when pres

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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Caffeine is a common drug that affects the central nervous system. Among Problem 3.4 the issues involved with caffeine are how does it get from the blood to the brain, and does the presence of caffeine alter the ability of similar compounds to move across the blood-brain barrier? In this experiment, 15 lab rats were randomly assigned to one of 3 treatments (0, 5, and 10 mM of caffeine). Each treatment consisted of an arterial injection of C14-labeled adenine together with a concentration of caffeine (0 to 50 mM). Shortly after injection, the concentration of labeled adenine in the rat brains is measured as the response (data from McCall, Millington, and Wurtman 1982). 0 mM 5 mM 10 mM 5.74 5.92 3.05 6.9 3.66 1.94 3.86 4.62 1.23 6.94 3.47 3.45 6.49 1.33 1.61 What is the most appropriate test to determine if the three caffeine concentrations resulted to different mean adenine concentration of silage at 5% level of significance? Justify…
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Problem 2-5.5. But change the problem to say Gaussian noise variance of 2, and threshold of 6V.
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QUESTION 12 Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous 6 months, in a sample of 115 new-car buyers, 46 have traded in their old car. To determine (at the 10% level of significance) whether the proportion of new-car buyers that trade in their old car has statistically significantly decreased, what can you conclude concerning the null hypothesis?