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The following contingency table shows the distribution of grades earned by students taking a midterm exam in an MBA class, categorized by the number of hours the students spent studying for the exam. Complete parts a. and b. below.

a. Using a = 0.025, perform a chi-square test to determine if a student's grade on the exam and the hours spent studying for it are independent of one another.

  A B C
Less than 3 hours 5 16 10
3-5 hours 12 16 4
More than 5 hours 23 13 4