The confidence interval estimate of the expected value of y for a given value 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.
Analysis:
A. Incorrect. The confidence interval estimate will be narrower.
B. Correct. The confidence interval estimate will be narrower.
C. Incorrect. The confidence interval estimate will be narrower.
D. Incorrect. The confidence interval estimate will be narrower.
ANSWER : B
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