Question $2$

Given the data below:

$($a$)$

Forecast for Sep. using linear regression $(5$ Marks$)$

$($b$)$

Forecast for Sep. using $5-$period moving average $(5$ Marks$)$

$($c$)$

Forecast for Sep. using exponential smoothing. Alpha is $0\mathrm{.}2$ and the forecast the for march was $19(5$ Marks$)$

MonthSales $(1000)$Feb$19$Mar$18$Apr$15$May$20$Jun$18$Jul$22$Aug$20$