Using the data from Exercise 8 "Heights of Fathers and Sons," the linear correlation coefficient is r = -0.017.
Data From Exercises 8

Use Table 2-11 on page 71 to find the critical values of r. Based on a comparison of the linear correlation coefficient r and the critical values, what do you conclude about a linear correlation?
Table 2-11
Critical Values of the Linear Correlation Coefficient r
Number of Pairs of Data n ...................Critical Value of r
4 ...................................................................0.950
5 ...................................................................0.878
6 ...................................................................0.811
7 ...................................................................0.754
8 ...................................................................0.707
9 ...................................................................0.666
10.................................................................. 0.632
11.................................................................. 0.602
12.................................................................. 0.576

Height of father (in.) Height of first 74.0 73.5 71.0 70.5 72.0 76.5 74.0 71.0 72.0 73.2 son (in.) 73.0 75.5 75.0 75.0 75.0 74.0 74.0 73.0 73.0 78.5