A random sample of 6 music majors playing song S counted the number of mistakes each made. Then these musicians played song G and the mistakes were tallied. In between playing the two songs, the students practiced a more difficult song. Is there evidence that practicing a difficult song in between resulted in less mistakes?
Student 1 2 3 4 5 6
Mistakes(S) 9 10 6 9 5 8
Mistakes(G) 4 5 6 6 6 5
Difference 5 5 0 3 -1 3