Question: Fitting a complete second-order model. How many levels of x and x are required to fit the model E(y)=0+1x1+2x2+3x1x2+4x12+5x22? How large a sample is required

Fitting a complete second-order model. How many levels of x and x are required to fit the model E(y)=0+1x1+2x2+3x1x2+4x12+5x22? How large a sample is required to have sufficient degrees of freedom for estimating ?

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