For Exercises 13–20, do the following for the indicated data set:
- Construct a scatterplot of the relationship between and .
- Interpret the scatterplot.
- Calculate the correlation coefficient .
- Interpret the value of the correlation coefficient .
Question 4.15
15. The predictor variable and the response variable take the following values:
| −5 | −5 |
| −5 | −15 |
| 0 | −20 |
| 5 | −25 |
| 5 | −30 |
4.1.15
(a)
(b) The variables and have a negative linear relationship. (c) (d) This value of is very close to the minimum value . We would therefore say that and are negatively correlated. As increases, tends to decrease.