Professor Fair believes that extra time does not improve grades on exams. He randomly divided a group of 300 students in

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Professor Fair believes that 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 are shown in the following table. Test
at the 0.01 level of significance that time to complete a test and
test results are independent.
300
Find the sample test statistic. (Round your answer to two
decimal places.)