In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests." The article says that the overall statewide proportion of school buses that fail safety tests is 9%. However, one bus company has a higher rate of over 12%. Assume that we want a new estimate for the statewide proportion of school buses that fail the safety inspection. How large a sample would you have to take in order to construct a 95% confidence interval estimate for the true proportion of buses that fail the inspection and achieve a margin of error of plus or minus 2%? (your answer should be an integer)

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests." The
article says that the overall statewide proportion of school buses that fail safety tests is 9%.
However, one bus company has a higher rate of over 12%. Assume that we want a new estimate for
the statewide proportion of school buses that fail the safety inspection.
How large a sample would you have to take in order to construct a 95% confidence interval estimate
for the true proportion of buses that fail the inspection and achieve a margin of error of plus or
minus 2%? (your answer should be an integer)
Transcribed Image Text:In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests." The article says that the overall statewide proportion of school buses that fail safety tests is 9%. However, one bus company has a higher rate of over 12%. Assume that we want a new estimate for the statewide proportion of school buses that fail the safety inspection. How large a sample would you have to take in order to construct a 95% confidence interval estimate for the true proportion of buses that fail the inspection and achieve a margin of error of plus or minus 2%? (your answer should be an integer)
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