1400 1300 Linear Trend Model Yt=727.6 + 27.94xt Below are 2 plots showing 1) a comparison between the actual time series of Australia's Gross Box Office Sales ($m) and the within-sample and out-of-sample forecasts based on a chosen method; and 2) the residual plot based on the method used. Review these plots and answer the following questions. Trend Analysis Plot for Gross box office ($m) Gross box office ($m) 1200 1100 1000 900 800 700 Versus Order (response is Gross box office ($m)) 100 Variable Actual Fits Forecasts Accuracy Measures MAPE MAD MSD 4.88 48.10 2804.26 Residual -50 50 50 -100 2 4 6 8 10 12 14 16 18 20 22 2 4 6 8 Index 12 10 Observation Order 14 16 18 20 What is the estimated out-of-sample forecast for period no. 21? [Press CTRL and "-" to see the whole table by reducing the font size. Press CTRL and "+" to restore the font size] O a. 1310.5 O b. 1312.4 O c. 1314.3 O d. 1308.7