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Professor fair believes extra time does not improve grades

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Professor Fair believes extra time does not improve grades on exams. He randomly divided a group of 300 students into two groups and gave them all the same test. One group had exactly 1 hour in which to finish the test, and the other group could stay as long as desired. The results follow. Test at the .01 level of significance that time to do a test and test results are independent.
Exam Grades

Time A B C F Total
1 hour 23 42 65 12 142
Unlimited 17 48 85 8 158
Column total 40 90 150 20 300

Reference no: EM13629381

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