The National Highway System Designation Act of 1995 allows states to set their own highway speed limits. Most of the states have raised the limits. The November 2008 maximum speed limits on interstate highways (rural) for cars and trucks by each state are given in the following table (in miles per hour):

a. Build a cross-tabulation of the two variables vehicle type and maximum speed limit on interstate highways. Express the results in frequencies, showing marginal totals.
b. Express the contingency table you derived in part a in percentages based on the grand total.
c. Draw a bar graph showing the results from part b.
d. Express the contingency table you derived in part a in percentages based on the marginal total for speed limit.
e. Draw a bar graph showing the results from part d. If you are using a computer or a calculator, try the cross-tabulation table commands on page 124.

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TrucksState Cars Truck 75 65 75 75 75 75 State ars 70 70 Montana 65 65 Nebraska 75 75 Nevada 70 65 New Hampshire 65 65 70 55 New Jersey Arkansas California Colorado Connecticut Deloware Florida Georgia Hawaii daho 65 75 65 75 75 75 New Mexico 65 65 New York 65 65 North Carolina 70 70 70 70 North Dakoa 75 70 70 Ohio 60 60 Oklahoma 75 65 Oregon 65 55 Pennsyvania 70 65 Rhode Island 75 75 65 65 65 65 Indiana lowa 70 70 South Carolina 70 70 70 7 Suth Dakota 75 75 70 70 75 65 75 nsas Kentucky 65 65 Tennessee 70 65 70 Texas 65 Utah Louisiano 75 Maryland 665Virginia Massachusetts 65 5 Vermont 65 70 70 65 60 70 gan Minnesotoa SisSippi 70 60 Washingtorn 70 7 West Virginia 70 70 Visconsin 70 70Wyoming issouri 75 75