Question 1045268
CI=phat +/- 2.576 sqrt{(p)(1-p)/n}
1499/3107=0.482
0.482+/-2.576*sqrt(0.482)(0.518)/3107; the SE is 0.00896, the interval itself (SE*2.576) is 0.023
(0.459,0.505)
The answer is B.  We are completely confident in what the sample says; we use confidence to describe what we think of the population.