GCSE Maths (Edexcel)

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Outliers

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Statistics Statistics

Outliers

4:51 Analysing Data
Spec S4
Previous Range Next Comparing Data Sets
  • Outliers are data values that are greatly different from the other values in a dataset
  • Outliers can be much larger or much smaller than the other data values
  • Outliers greatly increase the range of the dataset, which is the difference between the greatest and smallest values
  • The range is not an accurate measure of the spread of the data when outliers are present
  • Outliers can also affect the calculated mean, which is a measure of central tendency
  • Outliers have no effect on the mode, which is the most frequently occurring value
  • Outliers may have some effect on the median, which is the middle value
  • The mean can be significantly affected by the inclusion of outliers, making it a poor measure of central tendency
  • It can be helpful to remove outliers from the data before calculating the mean or range
  • Removing outliers can result in a more accurate range and a mean that is closer to the median and mode
  • In exams, it may be specified when to consider omitting an outlier in calculations
  • It is important to be able to identify outliers and explain how they can affect calculations.

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