i. What does the MA(4) chart reveal? ii. Use the MA(4) model to forecast appliance sales in Q1- 1990. iii. Use the MA(4) model to forecast appliance sales in Q1-1991. iv. Is the Q1-1990 forecast most likely to underestimate, overestimate, or accurately estimate the actual sales on Q1-1990? Explain. v. Management feels most comfortable with moving aver- ages. The analyst therefore plans to use this method for forecasting future quarters. What else should be consid ered before using the MA(4) to forecast future quarterly shipments of household appliances