Question: Automobile insurance is much more expensive for teenage drivers than for older drivers. To justify this cost difference, insurance companies claim that the young drivers are much more likely to be involved in costly accidents. To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n = 300 accident reports from the police department. The motor vehicle department reports the percentage of registered drivers in each category as follows: 16% are under age of 20, 28% are 20 to 29 years old, and 56% are age 30 or older. The number of accident reports for each age group is as follows:

Under age 20 Age 20-29 Age 30 or older

68 92 140

DO the data indicate that the distribution of accidents for the 3 groups is significantly different from the distribution of drivers? Use alpha = 0.05.

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