Hours Spent Studying

22 20 29 24 43 46 39 40 51 43 39 51 52 65 57 56 52 66 63 68 67 42 65 69 72 66 53 45 58 81 60 57 77 78 67 78 72 58 71 76 79 83 65 72 71 52 78 70 81 80 79 72 75 91 65 84 77 78 72 84 83 67 80 78 72 70 94 92 84 98 78 78 84 74 90 83 84 83 78 93 80 101 81 83 91 83 93 78 78 65 84 97 88 93 93 95 95 91 95 94 95 102 105 83 99 97 79 101 88 93 95 94 104 88 80 98 83 91 90 83 92 88 99 101 101 99 102 84 110 93 105 109 91 104 95 98 91 104 104 106 95 106 92 101 95 109 95 101 105 104 104 105 95 109 110 101

Total Points Earned

12 18 25 25 28 29 35 39 40 43 43 49 50 51 53 53 55 55 57 57 59 59 59 60 60 61 61 61 62 62 62 62 62 63 64 64 64 64 65 65 66 66 66 66 66 67 67 67 67 68 68 68 68 68 68 69 69 70 70 70 70 70 71 71 72 72 72 72 73 73 73 73 73 74 74 74 74 75 75 75 75 76 76 76 76 76 76 76 77 77 77 77 77 78 78 78 79 79 79 79 80 80 80 80 80 81 81 81 82 83 85 85 85 85 86 86 86 86 87 87 88 88 89 90 90 90 90 90 91 91 91 91 92 92 92 92 93 93 94 95 95 95 95 96 96 96 96 96 97 97 97 98 99 100 100 100

(b) Develop an estimated regression equation showing how total points earned is related to hours spent studying. What is the estimated regression model? Let x represent the hours spent studying. If required, round your answers to three decimal places. For subtractive or negative numbers use a minus sign even if there is a + sign before the blank. (Example: -300)

= 8.6742 + 0.8014x (THIS IS THE CORRECT ANSWER NEEDED TO ANSWER D)

(d) How much of the variation in the sample values of total point earned does the model you estimated in part (b) explain? If required, round your answer to two decimal places.

Answer ___________%

(e) Mark Sweeney spent 80 hours studying. Use the regression model you estimated in part (b) to predict the total points Mark earned. If required, round your answer to the nearest whole number. Do not round intermediate calculations.

Answer $________________