Using a second predictor variable always increases the accuracy of prediction.

Question

Quizplus · Accepted Answer

Using a second predictor variable does not always increase the accuracy of prediction. The impact of adding a second predictor depends on the relationship between the predictor variables and the outcome variable, as well as the strength and direction of the correlation between the predictors. In some cases, adding a second predictor may improve the accuracy of prediction, while in other cases it may have little effect or even decrease accuracy.

Using a Second Predictor Variable Always Increases the Accuracy of Prediction