It is desired to estimate the mean number of hours of continuous use until a printer overheats. If it can be assumed tha

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answerhappygod
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It is desired to estimate the mean number of hours of continuous use until a printer overheats. If it can be assumed tha

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It is desired to estimate the mean number of hours of continuous use until a printer overheats. If it can be assumed that σ = 4 hours, how large a sample is needed so that one will be able to assert with 95% confidence that the sample mean is off by at least 15 hours?
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