3.20 ● ▼ A report from Texas Transportation Institute (Texas A&M University System, 2005) titled “Congestion Reduction Strategies” included the accompanying data on extra travel time for peak travel time in hours per year per traveler for different-sized urban areas.

Very Large Urban Areas Extra Hours per Year per Traveler Los Angeles, CA 93 San Francisco, CA 72 Washington DC, VA, MD 69 Atlanta, GA 67 Houston, TX 63 Dallas, Fort Worth, TX 60 Chicago, IL-IN 58 Detroit, MI 57 Miami, FL 51 Boston, MA, NH, RI 51 New York, NY-NJ-CT 49 Phoenix, AZ 49 Philadelphia, PA-NJ-DE-MD 38 Large Urban Areas Extra Hours per Year per Traveler Riverside, CA 55 Orlando, FL 55 San Jose, CA 53 San Diego, CA 52 Denver, CO 51 Baltimore, MD 50 Seattle, WA 46 Tampa, FL 46 Minneapolis, St Paul, MN 43 Large Urban Areas Extra Hours per Year per Traveler Sacramento, CA 40 Portland, OR, WA 39 Indianapolis, IN 38 St Louis, MO-IL 35 San Antonio, TX 33 Providence, RI, MA 33 Las Vegas, NV 30 Cincinnati, OH-KY-IN 30 Columbus, OH 29 Virginia Beach, VA 26 Milwaukee, WI 23 New Orleans, LA 18 Kansas City, MO-KS 17 Pittsburgh, PA 14 Buffalo, NY 13 Oklahoma City, OK 12 Cleveland, OH 10

a. Construct a comparative stem-and-leaf plot for extra travel time per traveler for each of the two different sizes of urban areas.

b. Is the following statement consistent with the display constructed in Part (a)? Explain.
The larger the urban area, the greater the extra travel time during peak period travel.