3. Raw data is rarely pretty and requires some work to convert into a usable format. The four years of data in the Excel I provided were precleaned and formatted for your analysis. The raw data is available from www.goldsheet.corn and will require some data cleansing to make the data match the data format in your spreadsheet. Copy the data from the "Historic Logs and Ratings\" for the 201? NFL season from the website, paste it into Excel, and clean and format it so that it looks exactly like the data in your worksheets for 20132016. a. Determine for each point spread what proportion of games are won by the favorite and what proportion are won by the underdog. Again, his will be most easily by using a Pivot Table. b. Create a scatter plot of the point spreads versus proportions using Excel. Fit a linear regression line to the data. Interpret the equation of the regression line How does your linear model compare with your results from your rst model