How much time do Americans living in or near cities spend waiting in traffic, and how much does waiting in traffic cost them per year? The file Congestion includes this cost for 31 cities. For the time Americans living in or near cities spend waiting in traffic and the cost of waiting in traffic per year:

a. Compute the mean, median, first quartile, and third quartile.

b. Compute the range, interquartile range, variance, standard ­deviation, and coefficient of variation.

c. Construct a boxplot. Are the data skewed? If so, how?

d. Compute the correlation coefficient between the time spent sit-ting in traffic and the cost of sitting in traffic.

e. Based on the results of (a) through (c), what conclusions might you reach concerning the time spent waiting in traffic and the cost of waiting in traffic.