23. Cynthia's Design Studios had sales the last four months of $13,700,$15,400,$17,100, and $18,800. Sales are related to how many designers Cynthia has on-duty. The sales forecast helps her decide on the proper staffing levels. a. What is the forecast for the fifth month using a two-period moving average? b. What is the forecast for the fifth month using =0.9 in an exponential smoothing model with A4=$18,800 and F4=$16,913 to get things started