Referring to the data in 12. .2:
a. Construct the 95% confidence interval for the mean commute time for Philadelphia and St. Louis.
b. Based on the confidence intervals found in part a, does it appear that the mean commute time is the same or different for these two cities? Explain.
c. Construct the 95% confidence interval for the mean commute time for Seattle.
d. Based on the confidence intervals found above, does it appear that the mean commute time is the same or different for Philadelphia and Seattle? Explain.
e. Based on the confidence intervals found above, does it appear that the mean commute time is the same or different for the set of three cities Philadelphia, St. Louis, and Seattle? Explain.
f. How do your confidence intervals compare to the intervals given for Philadelphia, St. Louis,