Question regarding the population distribution
A population's distribution is normal with a mean of 20 and a standard deviation of 5. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mean is more than 20?
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If you wish to estimate a population mean and have estimate be between +/- of the true value and you wish to have a confidence level of 99%., what sample size will be required if the population standard deviation is known to be 1.20?
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