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Confidence Intervals

October 29, 2010
Illustrating a 90% confidence interval on a st...

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Briefly

Because we are always dealing with imperfect information from usually limited sample sizes, you  rely on information there will always be some level of uncertainty.

A confidence interval is a range of values that tries to quantify this uncertainty.

Consider it as a range of plausible values. A narrow confidence interval implies high precision; we can specify plausible values to within a tiny range. A wide interval implies poor precision; we can only specify plausible values to a broad and uninformative range.

Confidence Interval

Confidence intervals are increasingly seen as more valuable than p-values as they indicate a range of possible effect sizes compatible with the data. The word data here refers to your observed mean difference between treatment and control groups.

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Categories: Statistical Concepts
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