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help with statistics homework

Science
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The estimate of the population proportion is to be within plus or minus 0.05, with a 95% level of confidence. The best estimate of the population is 0.15. How large a sample is required? ( Round up your answer to the next whole number)

sample size

Apr 10th, 2015

n=z^2sigma^2/E^2=  1.96*1.96*.15*.85/.05*.05 =236

Apr 10th, 2015

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