The variability of a distribution refers to the extent to which scores are spread or clustered. Variability provides a quantitative value to the extent of difference between scores. A large value refers to high variability. The aim of measuring variability is twofold:
Describing the distance than can be expected between scores;
Measuring the representativeness of a scores for the whole distribution.
What is the range of a measurement?The range of a measurement is the distance between the highest and lowest score. The lowest score should be subtracted from the highest score. The range gives information about extreme values, but not necessarily information about the rest of the values because it
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Understanding data: distributions, connections and gatheringsUnderstanding and knowing what sort of data you have is essential for conducting succesfull statistical tests. Here you will find general introductiory information about the types of data you will most likely encounter in your researches.
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