20. Callahan (2009) conducted a study to evaluate theeffectiveness of physical exercise programs forindividuals with chronic arthritis. Participants withdoctor-diagnosed arthritis either received a Tai Chícourse immediately or were placed in a control groupto begin the course 8 weeks later. At the end of the8-week period, self-reports of pain were obtained forboth groups. Data similar to the results obtained in thestudy are shown in the following table.Self-Reported Level of PainMeanSETai Chi course3.71.2No Tai Chi course7.61.7a. Construct a bar graph that incorporates all of theinformation in the table.b. Looking at your graph, do you think that participa-tion in the Tai Chi course reduces arthritis pain?

a. Excel is used to obtain the bar graph that incorporates all of the provided information. Steps…

Answered: 20. Callahan (2009) conducted a study…

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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A graduate student is interested in how viewing different types of scenes affects working memory. For his study, he selects a random sample of 36 adults. The subjects complete a series of working memory tests before and after walking in an urban setting. Before the walk, the mean score on the test of working memory was 9.1. After the walk, the mean score was 1.4 higher. The graduate student has no presupposed assumptions about how viewing different types of scenes affects working memory, so he formulates the null and alternative hypotheses as: H00 : μDD = 0 H11 : μDD ≠ 0 Assume that the data satisfy all of the required assumptions for a repeated-measures t test. The graduate student calculates the following statistics for his hypothesis test: Mean difference (MDD) 1.4 Estimated population standard deviation of the differences (s) 1.6 Estimated standard error of the mean differences (sMDMD) 0.2667 Degrees of freedom (df) 35 The t statistic 5.25 The critical values of t…
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