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In a
For this estimated regression equation SST = 1550 and SSE = 520.
a. At α = .05, test whether x1 is significant.
Suppose that variables x2 and x3 are added to the model and the following regression equation is obtained.
For this estimated regression equation SST = 1550 and SSE = 100.
b. Use an F test and a .05 level of significance to determine whether x2 and x3 together contribute significantly to the model.
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