Variance is a measure of how much values in a data set differ from the mean. Do scores tend to center around the mean or are they spread out For example, take two data sets each with 7 scores ranging from 1 to 9 and a mean of 5. The set with scores [1, 1, 3, 5, 7, 9, 9] has greater variance than the set with scores [1, 3, 5, 5, 5, 7, 9].
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Mohammed Looti, PSYCHOLOGICAL SCALES (2023) Variance. Retrieved from https://scales.arabpsychology.com/terms/variance/. DOI: 10.13140/RG.2.2.31575.96163