Guides ยท Science
Confidence Interval Basics
Understand confidence intervals
This guide explains confidence intervals: what they mean, how to interpret them, common misuses, and how sample size and variability affect interval width.
- confidence interval
- statistics
- uncertainty
- sample size
- interval width
Meaning
A 95% confidence interval is a range that would contain the true value in 95% of repeated samples.
Interpret correctly
Do not treat it as a probability the parameter lies inside; it reflects procedure reliability.
Width factors
Larger samples and lower variability shrink intervals; higher confidence widens them.
Avoid misuse
Don't compare overlapping intervals as definitive equality; use formal tests when needed.
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