MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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 companyhas 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. We take a sample of 200
buses and find that 20 buses fail the safety inspection.
What is the sample proportion of buses that fail the test? (Enter your answer as a decimal fraction
between 0 and 1, e.g. .27)
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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 companyhas 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. We take a sample of 200 buses and find that 20 buses fail the safety inspection. What is the sample proportion of buses that fail the test? (Enter your answer as a decimal fraction between 0 and 1, e.g. .27)
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