4. .) Three professors taught three different sections of a course last semester. The table below shows the grade distribution for each of the three professors. Grade Professor 1 Professor 2 Professor 3 Total A 12 11 27 B 16 29 25 C 35 30 15 OTHER 27 40 23 TOTAL Using a .01 significance level, test the null hypothesis that the grade and professor taken are independent.

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