Use the fоllоwing scenаriо аnd figure to аnswer the next three questions.A researcher is studying house prices. She starts with a model using only GrLivArea and gets a decent fit. Then she adds OverallQual, and the model improves a lot. After that, she adds an interaction term: SalePrice ~ GrLivArea + OverallQual + GrLivArea*OverallQual Now all three terms are significant, and the model fit improves compared with the model without the interaction term.