Question

PLEASE HELP AND SHOW WORKKKK...

A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 8% margin of error at a 95% confidence level, what size ofsample is needed? Give your answer in whole people. 150

Answer 1

Given a=0.05, Z(0.025)= 1.96 (from standard normal table)

So n=(Z/E)^2*p*(1-p)

=(1.96/0.08)^2*0.5*0.5

=150.0625

Take n=150