A random sample of 150 new car buyers who purchased Ford, General Motors (GM), and Chrysler models was selected, and their ages were recorded. The following table shows these data:

Age Ford GM Chrysler 20–29 5 11 11 30–39 8 23 7 40–49 16 15 5 50–59 24 15 10

a. Using a = 0.05, perform a chi-square test to determine if the age of the buyer and the car brand he or she purchased are independent of one another.

b. What conclusions can be made based on your results?

c. Determine the p-value using Excel and interpret its meaning.

d. Verify your results using PHStat.

AppendixLO1