Consider the following set of data points.

x −3 −2 −10123 y 9 4 10149

a. Compute the linear correlation coefficient, r.

b. Can you conclude from your answer in part

(a) that the variables x and y are unrelated? Explain your answer.

c. Draw a scatterplot for the data.

d. Is use of the linear correlation coefficient as a descriptive measure for the data appropriate? Explain your answer.

e. Show that the data are related by the quadratic equation y = x 2.

Graph that equation and the data points.