Using the data from Exercise 7 "Car Weight and Fuel Consumption," the linear correlation coefficient is r = -0.987.
Data From Exercise 7.

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

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