In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests." 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 estim. che statewide proportion of school buses that fail the safety inspection. We take a sample of puses and find that 90 buses fail the safety inspection. Based on the new sample data, I construct this 90% confidence interval estimate for p:
In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests." 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 estim. che statewide proportion of school buses that fail the safety inspection. We take a sample of puses and find that 90 buses fail the safety inspection. Based on the new sample data, I construct this 90% confidence interval estimate for p:
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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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 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. We take a sample of 500
buses and find that 90 buses fail the safety inspection.
Based on the new sample data, I construct this 90% confidence interval estimate for p:
152 < p < .208.
Explain what this confidence interval means.
O I am 90% sure that the number of buses that fail the inspection is between.152 and .208.
O I am 95% sure that the true proportion of buses that fail the inspection is between .152 and .208.
O I am 90% sure that the proportion of buses in this sample that fail the inspection is between .152 and .208.
O I am 90% sure that the true proportion of buses that fail the inspection is between .152 and .208.
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