# Errors and residuals in statistics/Related Articles

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- Confidence interval [r]: the range of a random variable, such as the mean of a sample, that — with a specified probability — contains the true value for the population.
^{[e]} - Factor analysis [r]: Statistical technique used to explain variability among observed random variables in terms of fewer unobserved random variables called factors.
^{[e]} - Normal distribution [r]: a symmetrical bell-shaped probability distribution representing the frequency of random variations of a quantity from its mean.
^{[e]} - Random variable [r]: a variable whose value is determined by chance rather than as a result of a known cause.
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