When predicting Y given X , _________.
A) the prediction is valid only within the range of X
B) the variability of the Y values over the range of the X values should be the same
C) the representativeness of the sample used to derive the regression line is an important consideration
D) all of these

Question

Quizplus · Accepted Answer

A) The prediction is valid only within the range of X because the regression line is only based on the observed values within that range.
B) The variability of the Y values over the range of the X values should be the same because the assumption of equal variance (homoscedasticity) is necessary for accurate predictions.
C) The representativeness of the sample used to derive the regression line is an important consideration because the regression line is only valid for the population represented by the sample.

When Predicting Y Given X , _________