A sample of 300 cars having cellular phones and one of 400 cars without phones were tracked for 1 year. The following table gives the number of these cars involved in accidents over that year.
|
|
Accident
|
NoAccident
|
|
Cellular phone
|
22
|
278
|
|
No phone
|
26
|
374
|
Use the above to test the hypothesis that having a cellular phone in your car and being involved in an accident are independent. Use the 5 percent level of significance.