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. Click the icon to view the contingency table. . 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. Identify the null and alternative hypotheses for a chi-square test of independence based on the information in the table. Choose the correct answer below. A. Ho: The variables A, B, C, less than 3 hours, 3-5 hours, and more than 5 hours are independent. H1 : At least one of the variables is not independent. O B. Ho: The variables A, B, C, less than 3 hours, 3-5 hours, and more than 5 hours are independent. H1: None of the variables are independent. O C. Ho: Grade and time spent studying are not independent of one another. H1 : Grade and time spent studying are independent of one another. D. Ho: Grade and time spent studying are independent of one another. H1 : Grade and time spent studying are not independent of one another. Find the chi-square test statistic. x2 = (Round to two decimal places as needed.) X Contingency table Grade Time Spent Studying A B C Less than 3 hours 17 3-5 hours 11 More than 5 hours 12 Print Done