1. For the data in the Excel file Olympic Track and Field Results, fit a multiple linear regression model using Discus Throw as the dependent variable and High Jump and Long Jump as the independent variables. How much does the fit improve over the simple linear regression which uses High Jump as the only independent variable? Interpret the key regression results. 2. The Excel file Cereal Data provides a variety of nutritional information about 67 cereals and their shelf location in a supermarket. Use regression analysis to find the best model that explains the relationship between calories and the other variables. Investigate the model assumptions and clearly explain your conclusions.