QUESTION $4(20$ Marks$)$

Study the information provided below and answer the following questions.

INFORMATION

Radasys Digicommerce Inc. $($RDI$)$ is an e$-$commerce enterprise specialising in consumer electronics. Presently, the

sales department at RDI utilises the Three$-$Quarter$-$Moving$-$Average Method $(3$QMAM$)$ to forecast demand for one of its

flagship products, an AI$-$driven gadget. The newly appointed Chief Demand Planner at RDI, tasked with driving innovation

and enhancing forecasting accuracy, suspects that regression modelling may offer a superior alternative. Consequently,

he plans to conduct a comparative analysis to assess the relative forecasting accuracy between the $3$QMAM and

regression analysis methodologies.

As an operations analyst at RDI, you have been assigned this task. The following sales data for the gadget is available: