is an estimate of σ2 when there are two independent variables and n-3 degrees of freedom.
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In the multivariable regression model: Y = B0 + B1 × Xli + B2 × X2i + εi, the formula for the standard errors of the estimated coefficients includes the variance of εi, which is represented by: σ2. Since the term is: A. not known with certainty, the expression σ2 is replaced with:  .B. not known with certainty, the standard errors of the coefficients cannot be estimated. C. not known with certainty, the expression σ2 is replaced with:  .D. known with certainty, the standard errors of the coefficients are known with certainty. |