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6. Given below are the number of semesters and the total number of units completed for 8 part-time students. Student #2 #3 #4 #5 #6 #7 #8 # semesters 7 9 3 7 8 3 10 12 # units 30 49 18 42 39 25 41 53 r=0.915, bo = 11.6, and bi = 3.5 (s) a) Use an a = 0.05 significance level to determine whether there is linear correlation between the number of semesters and total number of units completed. State the critical values and the conclusion about linear correlation. (4) b) Use an a = 0.05 significance level to determine whether there is linear correlation for: (1) r = 0.675 (2) r = -0.788 (4) c) Write the regression equation. Use the equation to find the best predicted number of units completed for a student after 6 semesters. () d) Should the regression equation be used to predict the number of units completed for a student after 14 semesters? Why or why not? () e) Should the regression equation be used to predict the number of units completed for a student ifr = 0.675 (see part (b))? Why or why not? If not, what is the best predictor