APFIVE Standard Deviation from a Confidence Interval
In a study comparing calcium absorption from two different supplements, 18 participants each tried both. The sample mean difference in absorption was 42 mg, and a 95% confidence interval for the true mean difference is (32 mg, 52 mg). Based on this interval, what is the sample standard deviation of the differences?
A
s cannot be determined from this information
B
s ≈ 10 mg
C
s ≈ 20.4 mg
D
s ≈ 4.7 mg
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