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Subject 6. Measures of Dispersion ons in the sample. However, the absolute value is difficult to work with mathematically.
The variance is a measure of how spread out a distribution is. It is computed as the average squared deviation of each number from its mean. <span>The formula for the variance in a population is
μ = the mean N = the number of scores
When the variance is computed in a sample, the statistic(m = the mean of the sample) can be used
last interval [days]
repetition number in this series
scheduled repetition interval
last repetition or drill
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