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)
Error Margin= 0.05
Confidence level CL=0.95
standard normal distribution
Standard normal distribution=z = 1.96 (95 percent
level of confidence)
n = (z ά/2/error)^2
(1.96/0.05)^2 (0.15)(0.85) =195.9
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