Question

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 95% confident that you estimate is within 1.5% of the true population proportion. How large of a sample size is required?

Answer 1

• Margin of error = 0.015

• z value for 95% Confidence is 1.96

• Z=1.96

  Sample = n= 0.5×0.5×(1.96/0.015)²

  =4268.44