Yen-Pi was interested in whether listening to love songs makes people more open

Yen-Pi was interested in whether listening to love songs makes people more open to love. She collected data from 50 single college students. She randomoly assigned half of the participants to listen to love songs, whereas the other half listened to non-romantic classical music. Then she measured both group’s interest in trying online dating. What is her independent variable?
a) Type of song: Love song vs. Classical 
b) Open to Love 
c) Interest in trying online dating
d) 50 single college students

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