OPERATION MANAGEMENT: Forecast Error Iteration with Weighted Moving Average Given weekly demand for $6$ periods: $200,220,210,230,250,240.$ Use $3-$period Weighted Moving Average with weights $(0\mathrm{.}5,0\mathrm{.}3,0\mathrm{.}2).$ Iteratively test different weight combinations $($e$.$g$.,(0\mathrm{.}6,0\mathrm{.}25,0\mathrm{.}15)).$ Calculate forecast and error $($MAD$)$ in each case. Identify which weights give minimum MAD and plot error trends.