a researcher wants to know if mood is affected by music. she conducts a test on a sample of 4 randomly selected adults and measures mood rating before and after being exposed to classical music. test the hypothesis that mood rating improved after being exposed to classical music. following are the mood ratings for the four participants: Before Exposure After Exposure
Participant#1 4.0 5.0
Participant#2 5.2 6.0
Participant#3 3.2 4.0
Participant#4 4.5 6.2
