Arandom 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 45-65 group, and 12% for the group over 65. calculate the chi-square test statistic
χ to test the claim that all ages have crash rates proportional to their driving rates.
1. under 26 = 66 drivers
2. 26-45 = 39 drivers
3. 46-65 = 25 drivers
4. over 65 = 30 drivers

25.05

Step-by-step explanation:

Given that 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 45-65 group, and 12% for the group over 65.

<2626-4546-65`>65  

Observed  O66392530160

Expected  E40404040160

Chi square      

(O-E)^2/E16.90.0255.6252.525.05

Thus we get chi square test statistic = 25.05  

i think the answer is b