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A statistics practitioner would like to estimate a population mean to within 40 units with 99% confidence given that the population standard deviation is 160.
a. What sample size should be used?
b. Redo the part changing the standard deviation to 50.
c. Redo part a using a 95% confidence level.
d. Redo part wherein we wish to estimate the population mean within 8 units.
a normal population has m 50 and s 8. a random sample of n 4 scores from this population has a mean of 54. what is
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