The effects of exercise on heart rate can be studied by analyzing the number of heart pumps according to physical exercises, while control variable is room temperature.
What is an independent variable?
An independent variable is any variable that isn't changed along the experimental procedure, while the dependent variable is modified by the conditions.
The sample size must be statistically significant (N sample size higher than 50 individuals) and a number of trials at least two to compare results.
In conclusion, the effects of exercise on heart rate can be studied by analyzing the number of heart pumps (dependent variables) according to physical exercises (independent variable), control variable is room temperature.
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