a)Does the age distribution of people cited differ significantly from the distribution of ages of all seat belt violators? Perform test of significance at a=0.05

b) Which age group has largest contributions to chi-square?

c) At these age groups cited more or less frequently than is justified?

25.18 Police Harassment? Police may use minor violations such as not wearing a seat belt to stop motorists for other reasons. A large study in Michigan first studied the population of drivers not wearing seat belts during daylight hours by observation at more than 400 locations around the state. Here is the popula- tion distribution of seat belt violators by age group: " Age group 16-29 30-59 60 or older Proportion 0.328 0.594 0.078 The researchers then looked at court records and called a random sample of 803 drivers who had actually been cited by police for not wearing a seat belt. Here are the counts: Age group 16-29 30-59 60 or older Count 401 382 20