Question 2.25

2.25 Strong association but no correlation

Here is a data set that illustrates an important point about correlation:

x 20 30 40 50 60
y 10 30 50 30 10
  1. Make a scatterplot of y versus x.
  2. Describe the relationship between y and x. Is it weak or strong? Is it linear?
  3. Find the correlation between y and x.
  4. What important point about correlation does this exercise illustrate?