133 You plan to conduct a survey on your college campus in l

133. You plan to conduct a survey on your college campus in learn about the political awareness of students. You want to estimate the true proportion of college students on your campus who voted to the 2012 presidential election with 95% confidence and a margin of error no greater than five percent. How many students must you Interview?

Solution

Q133.
Compute Sample Size ( n ) = n=(Z/E)^2*p*(1-p)
Z a/2 at 0.05 is = 1.96
Samle Proportion = 0.5
ME = 0.05
n = ( 1.96 / 0.05 )^2 * 0.5*0.5
= 384.16 ~ 385