# Question

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.

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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