Research Methods

Confidence Interval

A range that, under repeated sampling, would contain the true parameter 95% of the time (for a 95% CI).

Definition

A 95% confidence interval gives a plausible range for the true effect. Narrow intervals indicate precise estimates; wide intervals indicate uncertainty. CIs that include zero (for differences) or 1 (for ratios) indicate non-significance.

Related terms

P-valueThe probability of observing the data (or more extreme) if the null hypothesis were true.
Randomized Controlled TrialA study design randomly assigning participants to intervention or control — the gold standard of clinical evidence.

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