In Example 9.4c, which relates the height of a son to that of his father, the output from Program 9.2 yielded that

Thus,

In other words, 96 percent of the variation of the heights of the 10 individuals is explained by the heights of their fathers. The remaining (unexplained) 4 percent of the variation is due to the variance of a son’s height even when the father’s height is taken into account.
(That is, it is due to σ2, the variance of the error random variable.)

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Syy = 38.521, SSR = 1.497