(a) How large a sample would be needed to estimate the true proportion of jets with the wiring problem, with 90 percent confidence and an error of ± 9 percent? (Enter your answer as a whole number. Use a z-value taken to 3 decimal places in your calculations. Sample size (b) Would the airline actually conduct further sampling, or just inspect all the planes?
(a) How large a sample would be needed to estimate the true proportion of jets with the wiring problem, with 90 percent confidence and an error of ± 9 percent? (Enter your answer as a whole number. Use a z-value taken to 3 decimal places in your calculations. Sample size (b) Would the airline actually conduct further sampling, or just inspect all the planes?
Chapter1: Financial Statements And Business Decisions
Section: Chapter Questions
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Inspection of a random sample of 19 aircraft showed that 13 needed repairs to fix a wiring problem that might compromise safety.
(a) How large a sample would be needed to estimate the true proportion of jets with the wiring problem, with 90 percent confidence
and an error of ± 9 percent? (Enter your answer as a whole number. Use a z-value taken to 3 decimal places in your calculations.)
Sample size
(b) Would the airline actually conduct further sampling, or just inspect all the planes?
O Conduct further sampling
O Inspect all the planes
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