Using the data from Exercise 5 "Brain Volume and IQ," the linear correlation coefficient is r = 0.127.
Data From Exercise 5

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

Brain volume (cm31173 IQ 1067 1347 1029 1204 113 101 93 94 97