Peter Believes Listening to Relaxing Music Will Improve Memory

Multiple Choice

Peter believes listening to relaxing music will improve memory.He designs a study in which 15 people listen to relaxing music while studying for 30 minutes and 15 people study in a quiet room for 30 minutes.He measures how much they remember from the material they studied.In this example, the independent variable is:

A) the amount that the participants remember from the material they study
B) what the participants hear while they study (relaxing music or no music)
C) the number of people who take part in the experiment
D) the length of time the participants were allowed to study the material