The coefficient of standardized means, based on the random effect model, was used to measure the mean effect size and the Q statistic was used to determine the significance of moderator variables. In this meta-analysis study, data obtained from 488 independent findings from 74 countries in the seven surveys of TIMSS and a sample of 429,970 students was included. Is homework worth these investments? The study aimed to investigate whether the amount of time spent on homework had any effect on academic achievement and to determine moderators in the relationship between these two terms by using TIMSS data through the meta-analysis method. Homework is a common instructional technique that requires extra time, energy, and effort apart from school time.
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