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The travel-to-work time for residents of the 15 largest cities in the United States is reported...

The travel-to-work time for residents of the 15 largest cities in the United States is reported in the 2003 Information Please Almanac. Suppose that a preliminary simple random sample of residents of San Francisco is used to develop a planning value of 6.41 minutes for the population standard deviation.

Round your answers to nearest whole number.

a. If we want to estimate the population mean travel-to-work time for San Francisco residents with a margin of error of 4 minutes, what sample size should be used? Assume 95% confidence.

b. If we want to estimate the population mean travel-to-work time for San Francisco residents with a margin of error of 2 minutes, what sample size should be used? Assume 95% confidence.

Math   Statistics-And-Probability   
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