A random sample of 400 freshmen students at University Park campus is taken to estimate the percentage of freshmen who have taken a tour of Pattee Library during orientation week. Of the 400 freshmen, 160 (40%) of them have taken a tour of Pattee Library. The 95% confidence interval for the population percentage for all freshmen who have taken a tour of Pattee Library during orientation week is:
40 +/- 2.0*160=?
I dont know how to put this in the calulator or how to do this at all.
