Historical demand for a product is

a$.$ Using a weighted moving average with weights of $0\mathrm{.}60,0\mathrm{.}30,$ and $0\mathrm{.}10,$ find the July forecast.

b$.$ Using a simple three$-$month moving average, find the July forecast.

c$.$ Using single exponential smoothing with $=0\mathrm{.}2$ and a June forecast $=13,$ find the July forecast. Make

whatever assumptions you wish.

d$.$ Using simple linear regression analysis, calculate the regression equation for the preceding demand data.

e$.$ Using the regression equation in part $(d),$ calculate the forecast for July.