- An interval which is expected to contain the parameter being estimated. More specifically, given a confidence level γ (95% and 99% are typical values), a CI is a random interval which contains the parameter being estimated γ% of the time. The confidence level, degree of confidence, or confidence coefficient represents the long-run proportion of CIs (at the given confidence level) that theoretically contain the true value of the parameter. For example, out of all intervals computed at the 95% level, 95% of them should contain the parameter’s true value. ← Wikipedia
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