Question 1120679
The half interval for 90% CI is +/- z*SE, where z is 1.645 and SE is sqrt(.48*.52/200)
1.645*0.0353 or 0.0581
So the interval is 48%+/-5.81%
or (0.4219, 0.5381)

For n=500 the SE is 0.0223 and the half interval 0.0368

(0.4432, 0.5168)