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4. In a survey of 15 high school students, the mean grade on the English regents was 68.4 with a standard deviation of 7.2. a).

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4. In a survey of 15 high school students, the mean grade on the English regents was 68.4 with a standard deviation of 7.2. a). Find a 95% confidence interval estimate of the true mean of high school students grade on the English regents. Calculator answer: Your answer (correctly rounded)

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