In a multiple linear regression based on eight observations, the following sample regression is obtained: y =
Question:
In a multiple linear regression based on eight observations, the following sample regression is obtained: ŷ = 22.81 + 0.85x1 - 0.71x2 with se = 4.69. Also, when x1 equals 50 and x2 equals 20, se(ŷ0) = 2.18.
a. Construct the 95% confidence interval for E(y) if x1 = 50 and x2 = 20.
b. Construct the 95% prediction interval for y if x1 = 50 and x2 = 20.
c. Which interval is narrower? Explain.
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a With df n k 1 8 2 1 5 and 005we find t 2 df t 00255 2571 b c The confidenc...View the full answer
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Related Book For 
Business Statistics Communicating With Numbers
ISBN: 9781259957611
3rd Edition
Authors: Sanjiv Jaggia
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