The confidence interval estimate of the expected value of y for a given value y x, compared to the prediction interval of y for the same given value of x and confidence level, will be:
A) wider
B) narrower
C) the same
D) impossible to know

Question

Quizplus · Accepted Answer

The confidence interval estimate of the expected value of y for a given value of x is narrower than the prediction interval for y for the same given value of x and confidence level because the prediction interval also accounts for the variability (error) in individual observations, not just the mean.

The Confidence Interval Estimate of the Expected Value of Y