SOLUTION: Please help me solve this statistic problems: A research worker wishes to estimate the mean of a population using a simple large enough that the probability will be 0.95 that th

Question 760622: Please help me solve this statistic problems:
A research worker wishes to estimate the mean of a population using a simple large enough that the probability will be 0.95 that the sample means will not differ from the population mean by more than 25 percent of the standard deviation. How large a sample should he take?
thank you so much
.............
cheers
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A research worker wishes to estimate the mean of a population using a sample large enough that the probability will be 0.95 that the sample means will not differ from the population mean by more than 25 percent of the standard deviation. How large a sample should he take?
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n = [z*s/E]^2
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n = [1.96*s/(0.25s)]^2 = [1.96/0.25]^2 = 62 when rounded up
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Cheers,
Stan H.
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