Regression Equation Problems
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In a regression analysis involving 27 observations, the following estimated regression equation was developed.
y = 25.2 + 5.5x1
For this estimated regression equation SST = 1550 and SSE = 520
a. At a = .05, test whether x1 is significant.
Suppose that variables x2 and x3 are added to the model and the following regression equation is obtained.
y = 16.3 + 2.3x1 + 12.1x2 - 5.8x3
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 contribute significantly to the model.
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The expert examines regression equation observations.
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