Hypothesis A: If heart rate is related to caffeine intake, then coffee drinkers will have higher heart rates.
Hypothesis B: If a higher heart rate is related to caffeine intake, then the heart rate of most people will be higher 30 minutes after they drink a cup of coffee.
Which hypothesis is more useful and why?
A. The two hypotheses are equally useful.
B. Hypothesis A is more useful because it's true.
C. Neither hypothesis is useful because they aren't testable.
D. Hypothesis B is more useful because it suggests a way to test the relationship between heart rate and caffeine intake.
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