Homework Help 8.4: (a) forecasts using 3 methods. (b) compare forecasts using MAD. (c) choose the best method and forecast July. 8.7: use 3 methods to forecast and use MAD and MSE to compare. (notes: will not have forecasts for all periods using 3-period MA; use actual for period 1 as forecast to start exp smoothing. 8.10: determine seasonal indices for each day of the week, and use them to forecast week : simple linear regression (trend) model. NOTE: Spreadsheets might be very useful for working these problems.