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Question: Many studies show that interspersing rest between practice sessions (spaced practice) produces better performance than a no-rest condition (massed practice). Most studies use short rests, such as minutes or hours. Bahrick et al. (1993), however, studied the effect of weeks of rest. Thirteen practice sessions of learning the English equivalents of foreign words were interspersed with rest periods of 2, 4, or 8 weeks. The scores (percent of recall) for all four participants in this study are in the accompanying table. Analyze the data with a one-factor repeated-measures ANOVA, construct a summary table, perform Tukey HSD tests, and write an interpretation.
Rest interval (weeks)
Subject 2 4 8
1 40 50 58
2 58 56 65
3 44 70 69
4 57 61 74
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