Question 3 - Science Practice Test for the NLN PAX

Based on the data provided, what was most likely the independent variable in this investigation?

Amount of Caffeine Heart Rate (bpm) at Rest Heart Rate (bpm) After 5 Min. Exercise Heart Rate (bpm) After 10 Min. Exercise
0 mg 72 85 91
5 mg 78 88 95
10 mg 80 92 98
15 mg 81 91 102

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