In a random sample of eight 8-to-12-year-old children, the sample mean time playing video games was 48.8 hours per month with sample standard deviation 3.5 hours. In a random sample of ten 13-to-18-year-olds, the sample mean time playing video games was 54.3 hours per month with sample standard deviation 5.3 hours. Assume that the two populations are normally distributed.
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