The following is the recent historical sales of Sony HDTV at a local BestBuy store. Month Jan Feb Mar April May Actual HDTV sales 84 79 78 77 92 Please calculate the parameter value of a, in the simple linear regression formula y=a+bx. Input should be an exact number. Question 7 1 pts The information of a forecasting method, in terms of actual sales and forecasted sales, is given in the table below. Actual sales 20 25 25 32 36 Forecasted sales 24 15 25 36 29 Please calculate the TS value of the forecasting method. Numbers only, keep three decimals if not exact, either round up or down is ok