Question

Which of the following is the purpose of a confidence interval for the fitted (predicted value) from a

regression model?

A) To estimate the value of a future observation for a given value of x.

B) To estimate the population mean of Y for a given value of x

C) To estimate the population slope of the regression model

D) To estimate the sample mean of Y for a given value of x.

Answer 1

Answer: option A is correct

Explanation:

the prediction interval is to cover a “moving target”, the random future value of y,

while the confidence interval is to cover the “fixed target”,

the average (expected) value of y, E(y).