Construct three new variables in your dataset: • nprevisit_sq=nprevisit*nprevisit • nprevisit_cu=nprevisit*nprevisit*nprevisit • nprevisit_qu=nprevisit*nprevisit*nprevisit*nprevisit Using sequential hypothesis testing, determine the order of the polynomial in a non-linear regression where the dependent variable birthweight is a polynomial function of nprevisit. (Start with a maximum order of 4.) What is the order of the polynomial that sequential hypothesis testing yields? Ensure that you allow for heteroskedasticity-robust standard errors in conducting your tests. O 1 O 3 4.

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