I need help with # 7 A and B only

(6) (b) obtain estimates for the monthly season factors, calculate the seasonally adjusted forecasts. (c) Let a = B = 0.2, 5o = 1,300.4, and Go = the slope estimate from part (a). Predict sales for 2015 using Holt's trend model. (c) Table 26.1: Monthly Sales of Walking Shorts at Maddie's Department Store. Year 1 Year 2 Year 1 Year 2 Actual shipments for 2015 were slightly lower than the forecasts in parts (a) and (b). Further slowdowns in growth are expected as the market matures. What are your recommendations for forecasting future shipments? Table 27.1: Global Smartphone Shipments Forecast from 2010 to 2014 (in million units). 112 90 January February March April May Juny 12 18 36 53 79 134 16 14 46 48 88 160 July August September October November December 130 83 52 49 N 26 45 23 21 Year Global Smartphone Shipments in Million Units 2009 173.5 7. There has been a steadily increasing number of smartphone shipments worldwide between 2009 and 2014, as shown in Table 2E7.1. 2010 304.7 2011 494.5 (a) 2012 725.3 Construct a simple regression model to predict global shipments for 2015-2018. 2013 1019.7