PROBLEM 5 The travel-to-work time for residents of the 25 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 minutes for the population standard deviation. a. If we want to estimate the population mean travel-to-work for San Francisco residents with a margin of error of 2 minutes, what sample size should be used? Assume 99% confidence. O b. If we want to estimate the population mean travel-to-work for San Francisco residents with a margin of error of 30 seconds, what sample size should be used? Assume 95% confidence. 2.

Q: (7) The commuting distance(in miles) for 12 students is listed below. 11.5, 21.9, 12.7, 9.0, 19.2,…

A: 7)Given data is11.5, 21.9, 12.7, 9.0, 19.2, 18.5, 19.3, 1.9, 19.2, 0.8, 28.8, 17.7

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A: The provided information are:

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A: Solution

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A: Formula :

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A:

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A: We will standardize the normal variable and then use standard Normal table to find the required.

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A: The formula to find skewness is given below:

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A:

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A:

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A: Here from the given information population is normally distributed with mean = 9 and standard…