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help with statistics homework

Statistics
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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 11th, 2015

Error Margin= 0.05

Confidence level CL=0.95

Predicted population p=0.15

ά=1-CL=1-0.95=0.05

Percentile of standard normal distribution

=100(1- ά/2)th

Standard normal distribution=z = 1.96 (95 percent level of confidence)
n = (z ά/2/error)^2 p (1-p)
n = (1.96/0.05)^2 (0.15)(0.85) =195.9
196 samples required.


Apr 11th, 2015

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