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

Among drivers who have had a car crash in the last year, 250
were randomly selected and categorized by age, with the results
listed in the table below.
Age
Under 25
25-44
45-64
Over 64
Drivers
97
62
38
53
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%, 13% of the subjects, respectively. At the
0.025 significance level, test the claim...

Among drivers who have had car crashes in the last year, the
data was collected by age of driver and appears in the table below.
If the ages all had the same crash rate we would expect the
probability (percentage) shown in the table as well. (This is
adjusted to account for the percentage of that age group in the
driving population as a whole.) Using the methods that you learned
with Chi-Square Goodness of Fit, test the data at...

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