In a Regression Analysis of a First-Order Model Involving 3

Multiple Choice

In a regression analysis of a first-order model involving 3 predictor variables and 25 observations, the following estimated regression equation was developed. = 12 - 18x₁ + 4x₂ + 15x₃ Also, the following standard errors and the sum of squares were obtained.
S_b1 = 3
S_b2 = 6
S_b3 = 7
SST = 4900
SSE = 1296
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At the 5% level, the coefficient of x₁

A) is significant.
B) is not found to be significant.
C) cannot be tested, because not enough information is provided.
D) should be estimated again, because it is incorrect in the above equation.