Question: Problem 10.14 (a) Verify Equation 10.19, which asserts that (yi yi)=0. (b) Verify Equation 10.20, which asserts that (yi yi)xi = 0. (c)

Problem 10.14

(a) Verify Equation 10.19, which asserts that (yi − yˆi)=0.

(b) Verify Equation 10.20, which asserts that (yi − yˆi)xi = 0.

(c) Verify Equation 10.21, which asserts that the arithmetic mean of the observed values equals the arithmetic mean of the fitted values; that is, 1 n yi = 1 n yˆi

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