Mathematics, 15.04.2021 18:40 vorequeen

In a random sample of 80 students in first grade, the mean hours of sleep per Night was 9.4 with a standard deviation of 0.41 in a random sample of 50 students in the 12th grade mean hours of sleep per night was 7.5 with a standard deviation of 0.52. Which intervals is a 99% confidence interval for the difference between the mean hours of sleep?

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