If including an interaction between two variables increases the practical utility of the model:

If including an interaction between two variables increases the practical utility of the model:

R²will be lower and 2s will be higher in the model with the interaction term

R²will be higher and 2s will be lower in the model with the interaction term

R²will be higher and 2s will be lower in the model without the interaction term

R²will be lower and 2s will be lower in the model without the interaction term