Confidence Interval Interpretation for Two Means
Researchers compared the effects of two medications on blood pressure reduction. Based on random samples of patients, they calculated a 99% confidence interval of (3.5, 12.8) mmHg for the difference in the mean reduction (Medication X minus Medication Y). A colleague offered the following interpretation: “We can be 99% certain that the true difference in mean blood pressure reduction between these medications is between 3.5 and 12.8 mmHg.” What key element is missing from this interpretation?
A
The confidence level (99%)
B
Reference to the populations from which the samples were drawn
C
The direction of the difference (Medication X - Medication Y)
D
The units of measurement (mmHg)
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