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19 subjects take part in a math exam, followed by an intervention and a post-test. From their pre-test/post-test difference scores, there was a mean difference

19 subjects take part in a math exam, followed by an intervention and a post-test. From their pre-test/post-test difference scores, there was a mean difference of 13.19, with a standard deviation of 22.3.

Calculate the 95% confidence interval of the difference.

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