which-of-the-following-is-a-critical-step-in-designing-an-experiment-to-test-the

Question

Which of the following is a critical step in designing an experiment to test the hypothesis that 'caffeine increases heart rate'?

Accepted Answer

Measure heart rate before and after caffeine consumption.

Answer

Only test on individuals who consume caffeine regularly.

Answer

Assume caffeine affects everyone the same way.

Answer

Ignore any data that contradicts the hypothesis.