9 lines
543 B
TeX
9 lines
543 B
TeX
Researchers were interested in the short-term effect that caffeine has
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on heart rate. They enlisted a group of volunteers and measured each
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person's resting heart rate. Then they had each subject drink 6 ounces
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of coffee. Nine of the subjects were given coffee containing caffeine
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and 11 were given decaffeinated coffee. After 10 minutes each person's
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heart rate was measured again. The data in the table contains the
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change in heart rate; a positive number means that heart rate went up
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and a negative number means that heart rate went down.
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