Calculate a forecast using a simple three$-$month moving average$\mathrm{.}2.$ Calculate a forecast using a three$-$period weighted moving average. Use weights of$0\mathrm{.}60,0\mathrm{.}30,$ and $0\mathrm{.}10$ for the most recent period, the second most recent period, andthe third most recent period, respectively$\mathrm{.}3.$ Calculate a forecast using the exponential smoothing method. Assume the forecastfor period $1$ is $9,500.$ Use alpha $=0\mathrm{.}40\mathrm{.}4.$ Once you have calculated the forecasts based on the above data, determine the errorterms by comparing them to the actual sales for $2020$ given below $$ Cengage