Problem $2$:

Determine forecast for periods $7_{\text{\&}}{8}_{?}$ using the following methods

$4-$period moving average

$2-$period weighted moving average with $t-1$ weighted $0\mathrm{.}9$ and $t-2$ weighted $0\mathrm{.}1$

Exponential smoothing with alpha$=0\mathrm{.}4$ and the period $6$ forecast being $385.$

$\backslash$table$[[$Period$,$Actual,$4-$Period,$2-$Per.Wgted.,Expon. Smooth.$],[1,450,,,],[2,380,,,],[3,340,,,],[4,375,,,],[5,430,,,],[6,410,,,],[7,390,,,],[8,,,,]]$