Mathematics, 17.12.2021 01:00, rachylt8152

À study of blood flow involved 27 healthy people aged 18 to 72. Each subject con flow was measured on the first and fifth days of the study. After 5 days, researchers measured what they called "significant improvement" in blood flow and the function of the cells that line the blood vessels. t3 What flaw in the design of this experiment makes it impossi- ble to say if the cocoa really caused the improved blood flow? Explain your answer.

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À study of blood flow involved 27 healthy people aged 18 to 72. Each subject con flow was measured o...