) Why does the denominator of 2 need to be the same as the degrees of freedom in the model ?
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5.)

Why does the denominator of ̂2need to be the same as the degrees of freedom in the model?a.) so we will know how the estimate is distributed if H

ois trueb.) so we can extrapolate the results to other values of xc.) so that the root MSE will be a positive numberd.) so the estimator will be unbiased
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