Author Question: A random sample of 160 car accidents are selected and categorized by the age of the driver ... (Read 79 times)

V@ndy87 · **on:** Feb 14, 2020

Question 1

A teacher finds that final grades in the statistics department are distributed as: A, 25%; B, 25%; C, 40%; D, 5%; F, 5%. At the end of a randomly selected semester, the following grades were recorded. Determine if the grade distribution for the department is different than expected. Use α = 0.01.

Question 2

A random sample of 160 car accidents are selected and categorized by the age of the driver determined to be at fault. 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 χ² used to test the claim that all ages have crash rates proportional to their driving rates.

◦ 75.101
◦ 101.324
◦ 95.431
◦ 85.123

shaikhs · **Reply #1 on:** Feb 14, 2020

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