Case Study

Consider monthly demand for the Marai Corporation as shown in the table below. Forecast the December sales based on the below questions.

Month	Sales
Jan	204
Feb	213
Mar	203
April	209
May	226
June	212
July	218
August	220
September	225
October	227
November	260
December	????

Use the spreadsheet analysis and show all related functions and models used to resolve the below issues

Forecast December sales using Naive method and compute relevant MAD

Forecast December sales using 2-month moving average and compute relevant MAD

Forecast December sales using the weighted average (50%/30%/20%) and compute relevant MAD

Forecast December sales using Regression and compute relevant MAD

Which method is the most accurate? Justify your answer