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Question 21 4 pts Consider a model for output viscosity, y, based on reaction temperature x1 and supplier x2, where temperature is a continuous variable and supplier is a categorical variable with two levels. Assume there will be differences in the intercepts and slopes of the regression lines for each supplier separately. What will be a suitable regression model using an indicator variable for x2? 0 v= BU+le1+B2x2+BSx1x2 O y=BU+le1+BZx2 O y=BU+le1 0 None of the above