Thirty minutes of exercise per day can reduce your blood pressure. Which of the following is a guideline for establishing causality? a) Look for evidence that smaller amounts of exercise produces a reduction

Thirty minutes of exercise per day can reduce your blood pressure. Which of the following is a guideline for establishing causality?

a) Look for evidence that smaller amounts of exercise produces a reduction in blood pressure.
b) Check if lower blood pressure is present or absent when exercise is present or absent
c) Perform a randomized, controlled experiment.
d) Control the number of minutes of exercise and blood pressure to get the same results.

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