Homework Answers
We can find out correlation coefficient (r) using the formula or technology.
Let's use excel for this.
First of all, enter the data in excel as follows:
| x | y |
| 20 | 340 |
| 18 | 350 |
| 15 | 360 |
| 11 | 370 |
| 12 | 380 |
| 9 | 390 |
| 8 | 400 |
Use the following excel command for finding the r.
=CORREL(Select x values, select y values)
We will get, r = -0.970
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