a) Forecasted sales for year 6 using the trend projection (inear regression) method are 634.8 sales (round your response to one decimal place). b) The MAD for a linear regression forecast is 6.9 sales (round your response to one decimal place). c) The MSE for the linear regression forecast is 51.8 sales (round your response to one decimal place). \begin{tabular}{cc} \hline Year & Sales \\ \hline 1 & 460 \\ 2 & 510 \\ 3 & 518 \\ 4 & 570 \\ 5 & 595 \\ \hline \end{tabular}