What 95% describes
In the frequentist interpretation, a 95% confidence procedure covers the parameter in 95% of repeated applications when its assumptions hold. It does not assign a 95% posterior probability to the parameter lying within a particular calculated interval.
Precision and its limits
Interval width depends on the data and method. A wide interval may be compatible with substantially different effects. More observations can improve precision without correcting measurement problems, selection bias or confounding.
Interpret the magnitude
Read the estimate and limits in relation to effects that matter for the question. Interpretation should not be reduced to whether the interval includes a null value. Practical importance also depends on context.
Interpretation limits
A confidence interval does not capture every source of bias or uncertainty.
Original references
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Research questions
Select tools by method, population and purpose. A thematic connection does not validate use in every case.
Educational content for framing research. Consult the original document, study population and methodology before interpreting a conclusion. Methodology