Discussion
The value of R2 .................
Answer: D
The value of R2 is between 0 and 1.
R2, the coefficient of determination, is the proportion of the variation in the dependent variable explained by the regression:
\[ R^{2} = 1 - \frac{SS_{res}}{SS_{tot}} \]
As a proportion it cannot be negative or exceed 1: 0 means the model explains nothing and 1 that it explains everything. The range -1 to 1 belongs to the correlation coefficient r, whose square, in simple regression, is R2. A value always above 1, or from -2 to 2, is impossible.
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