$-.4\mathrm{.}2$

$\backslash$table$[[$YEAR$,1,2,3,4,5,6,7,8,9,10,11],[$DEMAND$,7,9,5,9,13,8,12,13,9,11,7]]$

$4\mathrm{.}3$ Refer to Problem $4\mathrm{.}2.$ Develop a forecast for years $2$ through $12$ using exponential smoothing with $=4$ and a forecast for year $1$ of $6.$ Plot your new forecast on a graph with the actual data and the naive forecast. Based on a visual inspection, which forecast is better? PX

c$)$