Answer :
+1 is the coefficient of determination .
What does coefficient of determination mean?
A statistical model's ability to predict a result is indicated by the coefficient of determination (R2), a value between 0 and 1.
The proportion of variance in the dependent variable that the statistical model predicts can be understood as the R2 value.
From the given information
Coefficient of determination is +1
Because slope is negative that means correlation coefficient is also negative.
And all points lie on the straight line hence correlation is - 1
But coefficient of determination is r^2
= +1
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