The 25 students in our class sleep 7.5 hours on average. We also have the information that European college students sleep 8.4 hours on average, with a standard deviation of 2.36.  Do our class sleep significantly more hours than the overall European college students? (use two-tail test with 5% significance level)

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Q: Nationally, patients who go to the emergency room wait an average of 5 hours to be admitted into the…

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A: From the provided information, Population standard deviation (σ) = $1200 Sample mean (x̄) = $16000…

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A: For this study, we should use : t test for a population mean

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Q: Suppose that a manufacturer of laptop batteries claims that his product last more than 950 hours.…

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A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

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Q: A computer software vendor claims that a new version of its operating system will crash fewer than…

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