Question 4. [17 points] Consider the Triple Exponential Smoothing with quarterly data, that is, with four seasons in a year. a. Assume that you calculated the intercept, slope, and the seasonality factors at the end of Year 2, Quarter 4 (that is, Period 8) as: S8=50,G8=5,c5=1.2,c6=1,c7=0.6,c8=1.2. [4pt] What is the one-step ahead forecast made in Period 8 for Period 9 ? [5pt] What is the multi-step ahead forecast made in Period 8 for Period 11? b. [8pt] Assume you are in period 9 and calculated c9=1. Update c6,c7,c8,c9 (renormalize if needed)