You want to study whether music affects people’s ability to learn. You get a sample of college students. First, you have them study a list of words with soft classical music playing, then you test how...

You want to study whether music affects people’s ability to learn.  You get a sample of college students.  First, you have them study a list of words with soft classical music playing, then you test how many words they correctly remember.  Second, you have them study a list of words with loud heavy metal playing, then you test how many words they correctly remember.  You want to compare their learning/memory with the classical music to their learning/memory with the loud heavy metal music.  What kind of hypothesis test should you do?