A regression analysis (involving 45 observations) relating a dependent variable (Y) and two independent variables resulted in the following information. Y=0.408+1.3387X₁+2X₂ The SSE for the above model is 49. When two other independent variables were added to the model, the following information was provided. Y-1.2+3.0X₁+12₂+4.0X3+8X4 This latter model's SSE is 40. Perform a 95% confidence test to determine if the two added independent variables contribute significantly to the model.

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