Car manufacturers are interested in whether there is a relationship between the size of car an individual drives and the number of people in the driver's family (that is, whether car size and family size are independent). To test this, suppose that 797 car owners were randomly surveyed with the following results. Conduct a test for independence at the 5% level. Family Size Sub & Compact Mid-size Full-size Van & Truck
1 19 34 40 36
2 21 49 70 81
3-4 19 49 101 89
5+ 20 30 71 69

Required:
a. What are the degrees of freedom?
b. What is the test statistic? (Round your answer to two decimal places.)
c. What is the p-value? (Round your answer to four decimal places.)