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Time series and index numbers

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

How do index numbers track change over time, and how are RPI, CPI and GDP used?

Simple index numbers; chain base index numbers; weighted index numbers; the retail price index, consumer price index and gross domestic product; calculating and interpreting index numbers in context.
A focused answer to Edexcel GCSE Statistics on index numbers, covering simple index numbers, chain base index numbers, weighted index numbers at Higher tier, the retail price index, consumer price index and gross domestic product, and calculating and interpreting them in context.
9 min answer →

How do you calculate and interpret rates such as crude birth and death rates over time?

Rates of change over time including percentage change, births, deaths, house prices and unemployment; calculating crude rates with a given formula; standardised rates at Higher tier; making predictions from rates.
A focused answer to Edexcel GCSE Statistics on rates of change over time, covering percentage change, crude birth and death rates with the given formula, standardised rates at Higher tier, interpreting rates from tables and graphs, and using rate formulae to make predictions.
9 min answer →

How do moving averages reveal the trend in seasonal data and support predictions?

Time series graphs; identifying trends by inspection and by calculating moving averages; plotting a trend line; interpreting seasonal and cyclic variation; using trends and seasonal effects to predict.
A focused answer to Edexcel GCSE Statistics on time series, covering time series graphs, identifying trends by inspection and by moving averages, plotting a trend line, interpreting seasonal and cyclic variation, and using the trend and seasonal effect to make predictions.
10 min answer →