Dataset: trombone.dat Source: S.L. Ross(1985). "The Effectiveness of Mental Practice in Improving the Performance of College Trombonists," Journal of Research in Music Education, Vol.33, #4, pp.221-230 Description: Comparison of 5 experimental practice conditions for 30 trombonists from 3 colleges. Pre-test and post-test scores. Conditions: 1=All Physical Practice (PP) 2=All mental practice (MP) 3=Combination of physical and mental (CP) 4=Mental Practice with simulated slide movement (MPS) 5= No Practice Control (NP) Variables/Columns Condition 8 Pre-Practice 15-16 Post-Practice 23-24 PP dummy 32 MP dummy 40 CP Dummy 48 MPS Dummy 56 PPxPre 63-64 MPxPre 71-72 CPxPre 79-80 MPSxPre 87-88