Question $2($Nahmias $2\mathrm{.}37)$ Determine the updated estimates of the slope, the intercept, and the

seasonal factors for the end of $1993$ based on the following observations:

$1993$ Demand

$118$

$251$

$386$

$466$

Using these updated estimates, determine the forecasts that Winter's method gives for all of $1995$

made at the end of $1993.$ Use the values of the smoothing constants given in Problem $35($b$).$