Students in a class recorded their resting pulse rates and their pulse rates immediately after exercise. The data shown below. Student Tested Resting Pulse Rate Pulse Rate after Exercise Amrit 70 (after 97) Riya 74 (after 106) Maria 83 (after 120) Levi 60 (after exercise 91) max 78 average (122) Max Group Average is 73 (107) According to the data, the average pulse rate immediately after exercise was higher than the average resting pulse rate. Which procedure would increase the validity of the conclusions from this experiment?

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