Someone uses the PewHealth dataset to run a regression model that shows that various types of non-married people have different average scores on the Cellphone Use Index. Someone else looks at this...

Someone uses the PewHealth dataset to run a regression model that shows that various types of non-married people have different average scores on the Cellphone Use Index. Someone else looks at this regression model and says that these effects could really caused by age: widowed people are older, and people who have never been married are younger. Run these models, create a table that presents the nested models, and interpret the changes that occur from model to model.