Question: I am checking relationship between grades before and after anti addiction ban on time spent on playing video games in China. I have calculated the

I am checking relationship between grades before and after anti addiction ban on time spent on playing video games in China. I have calculated the correlation between grades and time spent (hours) for both before and after the policy. Made box plot. How shall I find if the policy was effective or not ? I have to use the statistics learnt in the course. I have learnt Normal distribution, z distribution and binomial distribution. Kindly advise

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