Doing so reduces the average effect size estimate to 0.08, and this average effect size is now marginally insignificant (95% confidence interval = −0.00, 0.16).
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Impact of summer programmes on the outcomes of disadvantaged or 'at risk' young people: A systematic review.
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( 2014 ) are themselves separately insignificant – by pooling the effect sizes produced together the aggregate effect size for the study becomes marginally significant.