Question: One can interpret r = 0.30 or the corresponding r 2 = 0.09 as follows: a. A 30% reduction in error occurs in using x

One can interpret r = 0.30 or the corresponding r² = 0.09 as follows:
a. A 30% reduction in error occurs in using x to predict y.
b. A 9% reduction in error occurs in using x to predict y compared to using y̅ to predict y.
c. 9% of the time ŷ = y.
d. y changes 0.3 unit for every one-unit increase in x.
e. x changes 0.3 standard deviations when y changes 1 standard deviation.

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