An orthopaedic nurse reviews two studies on early mobilization after hip fracture. Study A has a small sample and wide confidence intervals; Study B has a large sample and narrow confidence intervals. Which study provides more precise estimates?
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A
Study A, because smaller studies are less biased
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B
Study B, because larger samples yield narrower confidence intervals
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C
Both equally, as p-values determine precision
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D
Study A, because fewer confounders are present