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)

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.