At what value of R1.23 are all regression residuals zero?
1
Regression residuals represent the differences between observed and predicted values. When the correlation coefficient between two variables is exactly 1 or -1, the regression line perfectly fits the data, meaning the residuals are zero. Since we're asked for the value of R1,23, where all regression residuals are zero, the correct answer is R1,23 = 1.
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