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In a recent study of 53 ninth-grade students, the mean number of hours per week that they played video games was 72. The standard deviation

In a recent study of 53 ninth-grade students, the mean number of hours per week that they played video games was 72. The standard deviation of the population was 4.3. Find the 84% confidence interval for the mean of the time playing video games. Please show all work.

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