Part 1 ("hand" calculations with spreadsheet): Calculate estimates for the intercept (Do) and slope (Di) of the least-squares regression line with COST of GAIN as the dependent variable and MORTALITY as the independent variable. Use hand calculations and show all of your work using the following formulas (see format on back for setting up calculations in Excel). b = [xy-nxy (1) [ x- -n(x ) (2) bo = y - b, x