Question 1043438
CI interval for 95% is z*sqrt{ (p)*(1-p)/n}
That is 1.96*sqrt {(0.36)(0.64)/400}
'That is 1.96 sqrt (0.000576)=1.96*0.024=0.047
The interval is 0.36+/-0.047, or (0.313,0.407)