A poll is taken in which 307
out of 550
randomly selected voters indicated their preference for a certain candidate.

(a) Find a 90
% confidence interval for p
.

≤p≤


(b) Find the margin of error for this 90
% confidence interval for p
.


equation editorEquation Editor

(c) Without doing any calculations, indicate whether the margin of error is larger or smaller or the same for an 80% confidence interval.
A. smaller
B. larger
C. same