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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 |