APFIVE Confidence Interval and Causation
A researcher computes a 95% confidence interval for the difference in the proportion of patients experiencing side effects between two medications (pₐ - pᵦ) as (0.01, 0.09). The researcher claims, “Medication A causes significantly more side effects than Medication B.” Which statement best evaluates this claim?
A
The claim is invalid because the interval is too narrow.
B
The claim is invalid because the difference could be zero.
C
The claim is fully supported by the confidence interval.
D
The claim about a higher proportion is supported, but causation cannot be inferred.
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