Exam Page 6 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 two groups of drivers. They give the test to 580 drivers who have just finished driving 4 hours or less and they give the test to 470 drivers who have just finished driving 8 hours or more. The results of the tests are given below. Passed Failed Row Totals Drove 4 hours or less 450 130 580 Drove 8 hours or more 325 145 470 Is there is a relationship between hours of driving and alertness? (Do a test for independence.) Test at the .5 % level of significance