A car insurance company performed a study to determine whether an association exists between age and the frequency of car accidents. They obtained the following sample data.
|
Age under 25
|
Age between 25-45
|
Age over 45
|
Total
|
|
Number of accidents in past 3 years = 0
|
74
|
90
|
84
|
248
|
|
Number of accidents in past 3 years = 1
|
19
|
8
|
12
|
39
|
|
Number of accidents in past 3 years > 1
|
7
|
2
|
4
|
13
|
|
Total
|
100
|
100
|
100
|
300
|
State the null hypothesis for a chi-squared test of independence between the two variables. Specify the variables.