Does stretching before exercise reduce the chance of injury? To answer this question, a random sample of 800 athleteswas selected and split into two groups based on stretching preference. Of the 450 who do not stretch prior to exercise,231 suffered an injury during the previous year. Of the 350 who stretch prior to exercise, 55 suffered an injury during theprevious year. Is there enough evidence to conclude that stretching prior to exercise reduces the chance of injury basedon these data? Calculate the test statistic. You must show your work for full credit.

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Answered: Does stretching before exercise reduce…

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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Baylor University is interested in what proportion of applicants would like to enter statistics department. Of a random sample of 100 applicants, 24 chose the department. Construct a 99% confidence interval for the true proportion of all applicants that prefer statistics.
It is believed that 11% of all Americans are left-handed. A college needs to know how many left-handed desks to place in the big lecture halls being constructed on its campus. In a random sample of 120 students of its 12124 students, 15 were left-handed. Does this provide enough evidence to show that students at this college have a higher percentage of left-handers than the general American population? Use a 10% level of significance.
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Does stretching before exercise reduce the chance of injury? To answer this question, a random sample of 800 athletes was selected and split into two groups based on stretching preference. Of the 450 who do not stretch prior to exercise, 231 suffered an injury during the previous year. Of the 350 who stretch prior to exercise, 55 suffered an injury during the previous year. Is there enough evidence to conclude that stretching prior to exercise reduces the chance of injury based on these data? Find and interpret the p-value.
A random sample of high school seniors were asked whether they were applying for college. The resulting confidence interval for the proportion of students applying for college is (0.65,0.69). What is the margin of error?
A dowser has correctly located water for a well 1 out of 2 times in Jones County. In Jones County, someone who is just guessing has a 40% chance of locating water for a well. Does this sample provide sufficient evidence that the dowser can locate water and is not just guessing?
In a survey of 900 adults, 240 said that they watched the World Cup final on television. Using these sample statistics, calculate the margin of error, E, for a 90% confidence interval for the proportion of all adults that watched the World Cup final on television. A. 0.019 B. 0.024 C. 0.029 D. 0.034
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