Suppose you have a data set for predicting medical charges, and you have added a new independent variable 'weight' to the data set in an attempt to improve model performance. How would you determine if the addition of this independent variable is useful in predicting charges?

Answer choices Select only one option

• If adjusted R-squared decreases, it can be said that the added variable is useful for prediction.
• If R-squared decreases, it can be said that the added variable is useful for prediction.
• If adjusted R-squared increases, it can be said that the added variable is useful for prediction.
• If R-squared increases, it can be said that the added variable is useful for prediction.