A Random Sample of 160 Car Crashes Are Selected and Categorized

question 9

Essay

A random sample of 160 car crashes are selected and categorized by age. The results are listed below. The age
distribution of drivers for the given categories is 18% for the under 26 group, 39% for the 26-45 group, 31% for
the 46-65 group, and 12% for the group over 65. Test the claim that all ages have crash rates proportional to
their driving rates. Use $$\alpha$$ = 0.05. $$\begin{array} { l | c c c c } \text { Age } & \text { Under 26 } & 26 - 45 & 46 - 65 & \text { Over } 65 \\\hline \text { Drivers } & 66 & 39 & 25 & 30\end{array}$$

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