Question

5. Car Crashes and Age Brackets Among drivers who have had a car crash in the last year, 88 are randomly selected and categorized by age, with the results listed in the accompanying table (based on data from the Insurance Information Institute). If all ages have the same crash rate, we would expect (because of the age distribution of licensed drivers) the given categories to have 16%, 44%, 27%, and 13% of the subjects, respectively. At the 0.05 significance level, test the claim that the distribution of crashes conforms to the distribution of ages. Does any age group appear to have a disproportionate number of crashes?

Age:   Under 25 25–44 45–64 Over 64

Drivers: 36 21 12 19

Triola, Marc M.. Biostatistics for the Biological and Health Sciences (p. 527). Pearson Education. Kindle Edition.

Answer 1