Here are the music achievement scores for three groups of kids.

Are these three groups performing at significantly different levels? Are the group means significantly different?

a) Find the overall mean.

b) Find the mean for each group.

c) Calculate the between-groups sum of squares.

d) Calculate the within-groups sum of squares.

e) Calculate the mean sum of squares between groups. (What is the df?)

f) Calculate the mean sum of squares within groups. (What is the df?)
g) Calculate the F-ratio, and evaluate it against the null hypothesis that the three population means are equal.

Write a couple of sentences of interpretation.

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Table 9.8. Music achievement scores No Preparation 4,3,4,5 Conventional Music Instruction 5,5,4,6 Experimental Plan 5,6,7,8