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7. Useless Airways advertises that, on average, its New York to London flight takes five hours and 30 minutes. The Federal Trade
Commission randomly selects ten New York to London flights on Useless and finds that the sample mean is 5 hours with a sample
standard deviation of 0.8 hour.
a. What is the point estimate of the population mean?
b. Construct a 95 percent confidence interval for the population mean.
c. Explain what distribution is used for this problem & why.
d. Is it reasonable for Useless to claim a mean flight time of 5 hours and 30 minutes? Why?

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a. =5 b. we get a 95% confidence... View the full answer

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