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Classify the following graph as a cross-sectional study or a time-series study. Average Homework Scores 60- Scores 40- 20- 1 2 3 4 5 6

Classify the following graph as a cross-sectional study or a time-series study. Average Homework Scores 60- Scores 40- 20- 1 2 3 4 5 6 7 Day

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