8. A study on hearing impairment among workers in a construction sitehas been done. A random sample of 33 workers has been tested andthe results are as follows:P p.PS IR IRIR ISIA IAIA, IR 19, IRA IA, IR, IA. [Where p: problem with hearing impairmentp: no problem with hearing impairment)(a) Find a point estimate for the true proportion of all workers thatwould have hearing impairment.(b) Construct a 97.8% confidence interval for the true proportion ofall workers that would have hearing impairment.(c) Does it appear that at least 60% of workers suffer from thisproblem?

8. A study was conducted on hearing impairment among workers in a construction site.

Answered: (a) Find a point estimate for the true…

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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Mental health. The General Social Survey asked the question: “For how many days during the past30 days was your mental health, which includes stress, depression, and problems with emotions, not good?”Based on responses from 1,151 US residents, the survey reported a 95% confidence interval of 3.40 to 4.24days in 2010.(a) Interpret this interval in context of the data.(b) What does “95% confident” mean? Explain in the context of the application.(c) Suppose the researchers think a 99% confidence level would be more appropriate for this interval. Willthis new interval be smaller or wider than the 95% confidence interval?(d) If a new survey were to be done with 500 Americans, do you think the standard error of the estimatebe larger, smaller, or about the same.
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(a) Find a point estimate for the true proportion of all workers that would have hearing impairment. (b) Construct a 97.8% confidence interval for the true proportion of all workers that would have hearing impairment. (c) Does it appear that at least 60% of workers suffer from this problem?