Question 1161303
z*SE, where z is the particular z associated with the CI and SE is sqrt(p(1-p)/n)

the half-interval is z(0.995)*sqrt{(1/3)(2/3)/150}  or sqrt (p*(1-p)/n)
=2.576*sqrt(2/1350)=0.0992
the interval is 1/3+/-0.0992 or (0.234, 0.432)