Chisquare independence

College STATE UNIVERSITY OF NEW YORK ... > Module 7 > Module 7 Quiz A professor believes that extra time does not improve grades on exams. He randomly divided a group of 367 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 the claim that the time to complete a test and test results are independent at the 0.05 significance level. Ho: Extra time is independent of grade Ha: Grade is dependent on extra time given. 1 hour Unlimited time A 44 60 B 56 74 C or less 74 59 a. Complete the table: Give all answers as decimals rounded to 4 places. Observed Expected (0 - E)2 Frequency Frequency