A multi-part question on important time-series forecasting concepts; (1 point each; 3 points total) NOTE; PLEASE LABEL YOUR ANSWERS AS Part a), Part b), and so on. a) Define the term trend" as it applies to time-series forecasting. b) Describe the difference between "additive seasonal data and "multiplicative seasonal" data. c) What are the two Excel functions we use to calculate the MSE? A multi-part question on important time-series forecasting concepts; (1 point each; 3 points total) NOTE; PLEASE LABEL YOUR ANSWERS AS Part a), Part b), and so on. a) Define the term trend" as it applies to time-series forecasting. b) Describe the difference between "additive seasonal data and "multiplicative seasonal" data. c) What are the two Excel functions we use to calculate the MSE