A researcher is studying daily carbohydrate intake and the next day's first morning Accu-Chek value. After drawing a scatter plot, the researcher develops a multiple regression equation. What does the value R represent?
a. The line of best fit
b. The amount of change in Accu-Chek values that daily carbohydrate intake predicts
c. Daily carbohydrate intake times Accu-Chek value
d. The correlation between daily carbohydrate intake and the next day's first morning Accu-Chek value
ANS: D
R is defined as the correlation between the actual y values and the predicted y values using the new regression equation. The R2 represents the percentage of variance in y explained by the predictor and is called the coefficient of determination.
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