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.
Sb1 = 3
Sb2 = 6
Sb3 = 7
SST = 4900
SSE = 1296
The test statistic for testing the significance of the model is
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