Part C: Review Questions
How did holding your breath affect your heart rate?
Does the data support or refute the hypothesis?
Other than holding your breath, what can affect your heart rate? List at least three variables that can affect heart rate.
Choose one of the variables from your list, and design an experiment to test the impact on heart rate.
Formulate a hypothesis about how the variable will affect heart rate.
Test your hypothesis, and record the data in a data table similar to the one above.
Support or refute the hypothesis based on the results.
Why is it important to test only one variable during an experiment?