Man's Best Friend Dog Food Company plans to market a new dry dog chow in certain test cities around the nation. Primary interest rests on the weight gain it creates in various dog breeds. Data are provided in the MAN'S BEST FRIEND data set. WEIGHT is the weight of the dog in pounds after eating the food for 12 weeks, AGE is in years, BEGWGT is weight in pounds at the start of the experiment, and three breeds were identified as SMALL, MEDIUM, and LARGE. In each case a “1” was entered if it was determined the dog fell into that category. SERVING was the number of cups feed per day. Access the data set and regress WEIGHT on all other variables.

a. Identify the significant variables. What is the level of significance for each?

b. Find the difference in weight for each dog and determine if the difference is a function of the number of cups each was fed.