Population mean when population variance is unknown and population is normal
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Two situations may arise out of this, first one is when the population variance is known and the second situation is if the population variance is unknown. Population variance known. The hypothesis on population mean is necessary when it is unknown. Hypothesis is nothing but assuming certain mean for population data.
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It is assumed that the mean systolic blood pressure is μ = 120 mm Hg. In the Honolulu Heart Study.
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