Banning mobile phones creates 6.4% of standard deviation improvement in GCSE results: http://cep.lse.ac.uk/_new/publications/abstract.asp?index=4639 ….
Replying to @AndrewSabisky
@AndrewSabisky @Alby Unplanned sub-group analysis with interaction effect? I wouldn't trust that if I were you. :)
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