Researchers were interested in the effects of music on sleep quality. Persons who participated in the research project listened to special music recorded on a CD each night before they went to sleep. Their sleep quality was measured before the music intervention began and then at four-week intervals. The table shown presents the sleep quality scores of the research participants. Use these data to answer the questions in this exercise.

1. Calculate df_total.
2. Calculate df_between.
3. Calculate df_within.
4. Calculate df_subject.
5. Calculate df_error.

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Person Week 1 Week 2 Week 3 Week 4 Pretest 3 3 3 4 4 4 4 4 5 5 3 5 5 5 5 4 5 5 5 5 6 10 9.