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6.14 The following table shows the midterm and final exam grades obtained for students in a database course. y=wo + wix. wo = - WELT Midterm exam Final exam 72 84 D 50 63 (x-2)(yi-) 77 W1 81 74 78 94 90 86 75 59 49 83 79 65 77 33 52 REGRESSION 88 74 81 90 (a) Plot the data. Do x and y seem to have a linear relationship? (b) Use the method of least squares to find an equation for the prediction of a student's final exam grade based on the student's midterm grade in the course. (c) Predict the final exam grade of a student who received an 86 on the midterm exam