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17.-Past experience indicates that the standard deviation of the yearly income of truck drivers in the Northeastern United States is $800. How large of a sample of truck drivers would one need to take if one wished to estimate the population mean to within $75 with a 99% level of confidence?

19.-A tire manufacturer wishes to investigate the tread life of its tires. A sample of 36 tires were driven 50,000 miles each and revealed a sample mean of 0.32 inch of tread remaining. Historically, in other such tests, it is known that the standard deviation of the remaining tread is 0.09 inch. Construct a 95% confidence interval for the population mean of tread remaining on the tires.

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