The subjects do not know whether they are given aspirin or a placebo, and the evaluators who

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The subjects do not know whether they are given aspirin or a placebo, and the evaluators who measure the pulse rates also do not know. This trial is: 

(a) Single-blind

(b) Double-blind

(c) Not blinded

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Statistical Reasoning For Everyday Life

ISBN: 978-0134494043

5th Edition

Authors: Jeff Bennett, William Briggs, Mario Triola

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