What is the null hypothesis for the following question: Is there a relationship between heart rate and the number of cups of coffee drunk within the last 4 hours?
A. There will be no relationship between heart rate and the number of cups of coffee drunk within the last 4 hours.
B. People who drink more coffee will have significantly higher heart rates.
C. People who drink more cups of coffee will have significantly lower heart rates.
D. There will be a significant relationship between the number of cups of coffee drunk within the last 4 hours and heart rate.
Answer: A
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