Homework Answers
a. The predictor variable is # of days missed
The criterion variable is Final_exam score
b. The scatterplot
The relationship is negative and strong
c.
| Student | # days missed | Final_Exam Score |
| 1 | 3 | 16 |
| 2 | 2 | 17 |
| 3 | 5 | 13 |
| 4 | 8 | 7 |
| 5 | 4 | 12 |
| 6 | 7 | 11 |
| 7 | 6 | 14 |
| 8 | 1 | 12 |
| 9 | 5 | 11 |
| 10 | 9 | 4 |
| 11 | 6 | 5 |
| 12 | 4 | 10 |
| Mean | 5 | 11 |
| SD | 2.184 | 3.700 |
| x | y | (x-xmean)2 | (y-ymean)2 | (x-xmean)(y-ymean) | |
| 1 | 3 | 16 | 4 | 25 | -10 |
| 2 | 2 | 17 | 9 | 36 | -18 |
| 3 | 5 | 13 | 0 | 4 | 0 |
| 4 | 8 | 7 | 9 | 16 | -12 |
| 5 | 4 | 12 | 1 | 1 | -1 |
| 6 | 7 | 11 | 4 | 0 | 0 |
| 7 | 6 | 14 | 1 | 9 | 3 |
| 8 | 1 | 12 | 16 | 1 | -4 |
| 9 | 5 | 11 | 0 | 0 | 0 |
| 10 | 9 | 4 | 16 | 49 | -28 |
| 11 | 6 | 5 | 1 | 36 | -6 |
| 12 | 4 | 10 | 1 | 1 | 1 |
| V(X) | 5.166667 | sqrt(V(X)) = 2.273030283 |
| V(Y) | 14.83333 | sqrt(V(Y)) = 3.851406669 |
| COV(XY) | -6.25 |
Correlation coefficient = r =
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