You are conducting an experiment to determine the effect of…
You are conducting an experiment to determine the effect of music on the anxiety level of mice. You have 4 enclosures which contain speakers to deliver 3 different types of music to the mice. The 4th enclosure contains no speakers. After 2 hours in their chamber, a simple blood test is performed to determine the level of cortisol in the blood of each mouse (a measure of stress hormone). What is the independent variable in this experiment?