Question 1 (9 marks) A car dealer wants to forecast quarterly sales for each quarter of 2022, based on the data shown below: Year 2018 2019 2020 2021 Quarter 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 Sales 225 272 233 372 215 260 220 358 210 252 212 360 200 250 210 340 a. Determine quarterly seasonal relatives using the centered moving average method.

A car dealer wants to forecast quarterly sales for each quarter of 2022 , based on the data shown below