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4. (10 Points) The following questions are on confidence interval. Student Math Score Language Score A 90 86 B 80 83 C 69 86

4. (10 Points) The following questions are on confidence interval. Student Math Score Language Score A 90 86 B 80 83 C 69 86 81 E 96 F 88 93 G 81 (1) What's the confidence interval? (definition) (2) Is the true mean of math scores different with the true mean of languages score?

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