It is desired to estimate the mean number of hours of continuous use until a erheats. It can be presumed from experience that o = 3.5 hours. How large a needed so that one will be able to assert with 95% confidence that the sample E by at most 1.5 hours if population is normal;

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It is desired to estimate the mean number of hours of continuous use until a
printer overheats. It can be presumed from experience that o = 3.5 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 most 1.5 hours if
(a) the population is normal;
(b) the population is non-normal;
Transcribed Image Text:It is desired to estimate the mean number of hours of continuous use until a printer overheats. It can be presumed from experience that o = 3.5 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 most 1.5 hours if (a) the population is normal; (b) the population is non-normal;
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