Participants rated their mood score out of 20 before and after listening to Reign in Blood by the thrash metal band Slayer. 
What is the null hypothesis of this study?
A) Listening to Slayer is no better than listening to no music at improving mood score.
B) Listening to Slayer does not affect mood.
C) Listening to Slayer increases mood score.
D) Listening to Slayer decreases mood score.
Correct Answer:
Verified
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