← Statistics syllabus

EnglandStatistics

Summarising data

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do you compare two data sets fairly?

Comparing distributions using an average and a measure of spread, skewness, and writing comparisons in context.
A focused answer to AQA GCSE Statistics on comparing distributions, covering how to compare two data sets using an average and a measure of spread, describe skewness from the mean, median and mode, and write comparisons in context.
8 min answer →

How do you find a single typical value for a data set?

Mean, median and mode, averages from frequency tables, estimated mean from grouped data, and weighted means.
A focused answer to AQA GCSE Statistics on measures of central tendency, covering the mean, median and mode, averages from frequency tables, the estimated mean from grouped data using midpoints, and weighted means.
9 min answer →

How do you measure how spread out a data set is?

Range, interquartile range, percentiles, the effect of outliers, and choosing a measure of spread.
A focused answer to AQA GCSE Statistics on measures of spread, covering the range, interquartile range, percentiles, how outliers affect spread, and how to choose a suitable measure of spread.
8 min answer →

How do you find quartiles and use them to detect outliers?

Finding quartiles from a list and from cumulative frequency, the interquartile range, percentiles and identifying outliers.
A focused answer to AQA GCSE Statistics on quartiles and the interquartile range, covering how to find quartiles from a list and from a cumulative frequency curve, calculate the interquartile range, and use the 1.5 times IQR rule to identify outliers.
9 min answer →

How do you measure spread using every value in the data?

Variance and standard deviation, calculating standard deviation from a list and a frequency table, and interpreting it.
A focused answer to AQA GCSE Statistics on standard deviation, covering variance, calculating standard deviation from a list and from a frequency table, and interpreting standard deviation as spread around the mean.
10 min answer →