Loading…
Loading…
GCSE Statistics · key term
A regularly repeating effect in data collected over time. At a particular point, it is calculated as actual value minus trend value.
Used by Edexcel
Specification 2b.01, 2f.02 · Paper 1, Paper 2
Revise: Calculating averages for discrete and grouped dataWeighted mean, geometric mean and mean seasonal variation are Higher-tier content.
The difference between an actual value and the trend-line value at the same time: .
For mean seasonal variation, calculate actual value minus trend value, keeping negative signs, and average only variations for the same season.
Calculate seasonal variation as actual value minus trend-line value. Keep negative signs when finding the mean.
Create a free account to read GCSE Statistics revision notes for your exam board and track your progress.