During anatomy class, students were instructed to design an experiment to determine what types of stimuli influenced heart rate. One group wanted to investigate the effects of physical vs. psychological stress on heart rate. Each student’s baseline values for blood pressure, pulse, and respiration rate were recorded for one minute. Students were then asked to jump rope for 3 minutes. Once the exercise had been completed, each member’s blood pressure, heart and respiration rate were recorded. After resting for 20 minutes, a pop quiz was announced and students were asked to recall from memory all of the bones of the appendicular skeleton. Physiological data was recorded as students turned in their quiz papers. All of the data was recorded in the table. Your lab group is considering the conclusions that can be drawn from the data collected. Which conclusion is NOT valid?