Problems $1$ through $6$ are based on the following data. Observations of the demand for a certain part stocked at a parts supply depot during the calendar year $2013$ were a$)$ Determine the one$-$step$-$ahead forecasts for the demand for January $2014$ using $3-,6-,$ and $12-$month moving averages. b$)$ Using a four$-$month moving average, determine the one$-$step$-$ahead forecasts for July through December $2013.$ c$)$ Using a four$-$month moving average, determine the two$-$step$-$ahead forecast for July through December $2013.($Hint: The two$-$step$-$ahead forecast for July is based on the observed demands in February through May.$)$