Time$-$Series

$\backslash$table$[[$Month$,$Value,Forecast,Forecast E$],[1,105,,],[2,135,105,30],[3,120,114,6],[4,105,115\mathrm{.}8,],[5,90,112\mathrm{.}56,-13\mathrm{.}2],[6,120,105\mathrm{.}79,-22\mathrm{.}92],[7,145,110\mathrm{.}05,16\mathrm{.}248],[8,140,120\mathrm{.}54,34\mathrm{.}749],[9,100,126\mathrm{.}38,15\mathrm{.}849],[10,80,118\mathrm{.}46,-30\mathrm{.}491],[11,100,106\mathrm{.}92,-2\mathrm{.}9778],[12,110,104\mathrm{.}85,8\mathrm{.}214]]$

c$.$ Use a smoothing constant of $=0\mathrm{.}5$ to compute the exponential s enter $"0".$ Do not round intermediate calculations.

Time$-$Series

Month

Value

Forecast

Forecast Error