The Effect of Feedback and Operational Experience on Children's Rule Learning.

Front Psychol · 2017 · PMC5390043 · PMID 28450838

Europe PMC DOI

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did not achieve significanceno p-value reported

Specifically, without feedback, operation can improve accuracy by 15% in children solving the distance problem, but this increase did not achieve significance.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.