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Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA PM Exams › 205 bPP
For some quarterly sales data, the trend has been calculated as increasing by 6 each quarter and the average seasonal variation for the 3rd quarter as -22.5. The most recent data available is for the second quarter of Year 3 when sales were 370 units, and a centred moving average or the fourth quarter of Year 2 was 330.625 units.
Using the additive model, what are predicted sales for the third quarter of Year 3?
From qtr 8(qtr 4 period 2) to qtr 11(qtr 3 period 3) so that’s 3 changes
Start with 330.625 + (3 periods * 6) = 348.625 + sv -22.5 = 326.125
Have you watched our lectures on time series?