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13 February, 11:20

A student is testing to see how exercise affects heart rate. One group of students sits without exercising; one group of students runs; and one group of students swims. All students have their heart rates measured immediately before and after the session. Is this a controlled or comparison experiment?

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  1. 13 February, 14:18
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    Comparison. Controlled is where everything is the same (if I remember correctly) and comparison is comparing
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