the median. this is calculated by finding the midpoint in a ordered list.

this is most appropriate when there are anomalies in the data. this is because any extreme or unusual scores are not taken into account.

the mode is the most common value in a set of values.

this is most appropriate when dealing with category data. this is because it takes into account the frequency of data and can identify the most common score.

Another way of summarising and describing data is to calculate a measure of dispersion or the range.

this is most appropriate when finding out a distribution of the data. this is because the range shows how much the data varies e.g. the smaller the range the less the variation.

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