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GCSE Psychology · key term
The arithmetic average: the total of all scores divided by the number of scores.
Used by AQA and OCR
Paper 1, Paper 2
The total of all the values divided by the number of values.
Revise: Descriptive StatisticsThe mean, median and mode are measures of central tendency: they describe the centre or a typical value of a set of results. The range describes something different — how spread out the results are. It is a measure of dispersion.
A measure of central tendency calculated by adding all the values and dividing by the number of values.
Put scores in numerical order before finding the median. With an even number of scores, calculate the mean of the two middle values.
The mode is the most frequent value, not the number of times it appears. Keep repeated scores when calculating the mean.
State that the mean, median and mode are equal in a perfect normal distribution, not merely that they are all averages.
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Paper 1, Paper 2
The total of all scores divided by the number of scores.
Revise: Descriptive StatisticsThe mean, median and mode each do this differently. Dispersion describes how spread out the scores are. Using both gives a more useful summary than an average alone.
The arithmetic average: the sum of all scores divided by the number of scores.
