For Exercises 13–20, do the following for the indicated data set:

  1. Construct a scatterplot of the relationship between and .
  2. Interpret the scatterplot.
  3. Calculate the correlation coefficient .
  4. Interpret the value of the correlation coefficient .

Question 4.18

18. The number of days absent from a class, and the course grade:

Days absent Course grade
0 95
2 90
4 85
6 70
8 60