(14 points) Law enforcement agencies in Charlotte, NC conduct an average of 120,000 traffic stops per year. By law, the agencies collect information about all traffic stops, the reason for the stop, and the type of enforcement action taken. A random sample of 300 traffic stops revealed that 66 of the drivers were under 25 years of age. A total of 198 were issued a citation while the rest were given a verbal or written warning. A total of 38 drivers were under 25 years of age and issued a citation.

1. Use this information to complete the contingency table below.

AgeCitationWarningTotalUnder 2525 or olderTotal

2. What type of a study is this?

A.Observational Study

B.Experiment

3. Compute the difference in the proportions of drivers who received a citation in the two groups: