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EnglandStatistics

Time series

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do you smooth out seasonal variation to see the trend?

Calculating moving averages, choosing the period, centred moving averages, and plotting them to show the trend.
A focused answer to AQA GCSE Statistics on moving averages, covering how to calculate a moving average, choose the right period, use centred moving averages, and plot them to reveal the trend in a time series.
9 min answer →

How do you display and read data collected over time?

Time series graphs, trend, seasonal variation, cyclical and random variation, and reading time series data.
A focused answer to AQA GCSE Statistics on time series graphs, covering plotting data over time, identifying the trend, seasonal, cyclical and random variation, and reading and interpreting time series data.
8 min answer →

How do you use a trend to predict future values?

Trend lines through moving averages, the mean seasonal effect, and forecasting future values from a time series.
A focused answer to AQA GCSE Statistics on trend lines and forecasting, covering drawing a trend line through moving averages, calculating the mean seasonal effect, and forecasting future values from a time series.
9 min answer →