A trucking company wants to find out if their drivers are still alert after driving long hours. So, they give a test for alertness to 2 groups of drivers. They give the test to 330 drivers who have just finished driving 4 hours or less and they give the test to 215 drivers who have just finished driving 8 hours or more. The results are:

Passed Failed

drove 4hrs or less 250 80

drove 8hrs or more 140 75

Is there a relationship between hours of driving and alertness? (Do a test for independence). Test at 1% level of significance.