Question: 11.56. For the models E{y) = a + 0x and E{y) = a + 0ixi + 02X2, express null hypotheses in terms of correlations that

11.56. For the models E{y) = a + 0x and E{y) =

a + 0ixi + 02X2, express null hypotheses in terms of correlations that are equivalentto the following:

(a) Hq: 0 = 0

(b) Ho: 0i = @2 = 0

(c) Ho: 132 = 0

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