Which Procedure 2 Paints Which procedure should we use to test whether the mean GPA differs for Duke students, based on major? O proportion (2) confidence interval O i proportion (z) hypothesis test O 2 proportion (2) confidence interval O2 proportion (x) hypothesis test O 1 sample (t) confidence interval O 1 sample (t) hypothesis test O2 sample (t) confidence interval O 2 sample (t) hypothesis test O Chi-square Goodness of Fit Test Chi-square Test of Independence O ANOVA