1. You research commute times to work and find that the population standard deviation is 9.3 minutes. Repeat Exercise 17, using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.
2. You research driving distances to work and find that the population standard deviation is 5.2 miles. Repeat Exercise 18, using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.
3. You research repair costs of microwave ovens and find that the population standard deviation is $15. Repeat Exercise 19, using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.
4. You research repair costs of computers and find that the population standard deviation is $50. Repeat Exercise 20, using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.
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