Professor Gill has taught General Psychology for many years. During the semester, she gives three multiple-choice exams, each worth 100 points. At the end of the course, Dr. Gill gives a comprehensive final worth 200 points. Let x1, x2, and x3 represent a student's scores on exams 1, 2, and 3, respectively. Let x4 represent the student's score on the final exam. Last semester Dr. Gill had 25 students in her class. The student exam scores are shown below. x1 x2 x3 x4 73 80 75 152 93 88 93 185 89 91 90 180 96 98 100 196 73 66 70 142 53 46 55 101 69 74 77 149 47 56 60 115 87 79 90 175 79 70 88 164 69 70 73 141 70 65 74 141 93 95 91 184 79 80 73 152 70 73 78 148 93 89 96 192 78 75 68 147 81 90 93 183 88 92 86 177 78 83 77 159 82 86 90 177 86 82 89 175 78 83 85 175 76 83 71 149 96 93 95 192 a) If a student were to study "extra hard" for exam 3 and increase his or her score on that exam by 6 points, what corresponding change would you expect on the final exam? (Assume that exams 1 and 2 remain "fixed" in their scores.) (Use 1 decimal place.) b) Test each coefficient in the regression equation to determine if it is zero or not zero. Use level of significance 5%. (Use 2 decimal places for t and 3 decimal places for the P-value.) t P-value ?1 ?2 ?3
Professor Gill has taught General Psychology for many years. During the semester, she gives three multiple-choice exams, each worth 100 points. At the end of the course, Dr. Gill gives a comprehensive final worth 200 points. Let x1, x2, and x3 represent a student's scores on exams 1, 2, and 3, respectively. Let x4 represent the student's score on the final exam. Last semester Dr. Gill had 25 students in her class. The student exam scores are shown below.
x1 | x2 | x3 | x4 |
73 | 80 | 75 | 152 |
93 | 88 | 93 | 185 |
89 | 91 | 90 | 180 |
96 | 98 | 100 | 196 |
73 | 66 | 70 | 142 |
53 | 46 | 55 | 101 |
69 | 74 | 77 | 149 |
47 | 56 | 60 | 115 |
87 | 79 | 90 | 175 |
79 | 70 | 88 | 164 |
69 | 70 | 73 | 141 |
70 | 65 | 74 | 141 |
93 | 95 | 91 | 184 |
79 | 80 | 73 | 152 |
70 | 73 | 78 | 148 |
93 | 89 | 96 | 192 |
78 | 75 | 68 | 147 |
81 | 90 | 93 | 183 |
88 | 92 | 86 | 177 |
78 | 83 | 77 | 159 |
82 | 86 | 90 | 177 |
86 | 82 | 89 | 175 |
78 | 83 | 85 | 175 |
76 | 83 | 71 | 149 |
96 | 93 | 95 |
192 |
a) If a student were to study "extra hard" for exam 3 and increase his or her score on that exam by 6 points, what corresponding change would you expect on the final exam? (Assume that exams 1 and 2 remain "fixed" in their scores.) (Use 1 decimal place.)
b) Test each coefficient in the regression equation to determine if it is zero or not zero. Use level of significance 5%. (Use 2 decimal places for t and 3 decimal places for the P-value.)
t | P-value | |
?1 | ||
?2 | ||
?3 |
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