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# The following data come from a study designed to investigate drinking problems among college students.

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A. Use the chi-square test to evaluate the null hypothesis that the population proportions of students who drove while drinking are the same in the two calendar years

a. What do you conclude about the behavior of college students?

b. Again test the null hypothesis that the proportions of students who drove while drinking are identical for the two calendar years. This time, use the method based on the normal approximation to the binomial distribution that was presented in section 14.6. Do you reach the same conclusion?

c. Construct a 95% confidence interval for the true difference in population proportions.

d. Does the 95% confidence interval contain the value 0? Would you have expected that it would?