Both the Confidence Interval for , the Expected Value $x = x ^ { + }$

Short Answer

Both the confidence interval for , the expected value of Y when $x = x ^ { + }$ , and prediction interval for a future Y observation to be made when $x = x ^ { + }$ , are __________ for an $x ^ { + }$ near $\bar { x }$ than for an $x ^ { + }$ far from $\bar { x }$ .