4.34 Data on the gasoline tax per gallon (in cents) as of April 2010 for the 50 U.S. states and the District of Columbia are shown below (AARP Bulletin, June 2010).

State Gasoline Tax per Gallon Alabama 20.9 Alaska 8.0 Arizona 19.0 Arkansas 21.8 California 48.6 Colorado 22.0 Connecticut 42.6 Delaware 23.0 District of Columbia 23.5 Florida 34.4 Georgia 20.9 Hawaii 45.1 Idaho 25.0 Illinois 40.4 Indiana 34.8 Iowa 22.0 Kansas 25.0 Kentucky 22.5 Louisiana 20.0 Maine 31.0 Maryland 23.5 Massachusetts 23.5 Michigan 35.8 Minnesota 27.2 Mississippi 18.8 State Gasoline Tax per Gallon Missouri 17.3 Montana 27.8 Nebraska 27.7 Nevada 33.1 New Hampshire 19.6 New Jersey 14.5 New Mexico 18.8 New York 44.9 North Carolina 30.2 North Dakota 23.0 Ohio 28.0 Oklahoma 17.0 Oregon 25.0 Pennsylvania 32.3 Rhode Island 33.0 South Carolina 16.8 South Dakota 24.0 Tennessee 21.4 Texas 20.0 Utah 24.5 Vermont 24.7 Virginia 19.6 Washington 37.5 West Virginia 32.2 Wisconsin 32.9 Wyoming 14.0

a. The smallest value in the data set is 8.0 (Alaska)
and the largest value is 48.6 (California). Are these values outliers? Explain. (Hint: See Example 4.11.)

b. Construct a boxplot of the data set and comment on the interesting features of the plot.