When predicting Y , adding a second predictor variable to the first predictor variable X , will _______.
A) always increase prediction accuracy
B) increase prediction accuracy depending on the relationship between the second predictor variable and X
C) Increase prediction accuracy depending on the relationship between the second predictor variable and Y
D) b and c

Question

Quizplus · Accepted Answer

Adding a second predictor variable may or may not increase prediction accuracy, depending on the relationship between the second predictor and both the first predictor and the outcome variable. Therefore, both option B and C are correct, making the answer D.

When Predicting Y , Adding a Second Predictor Variable to the First