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A confidence interval is an interval that covers an unknown parameter with $100(1-\alpha)\%$ confidence. Confidence intervals are a frequentist concept. They are often confused with credible intervals which is the Bayesian analog.

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Interpreting a negative confidence interval

How do I interpret a negative confidence interval when comparing two population means? For example, a confidence interval is $(-23.11, -1.02)$, what is the significance of these values being negative …
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