Yolanda conducted a poll and out of the 270 people she
surveyed, 60% were planning to live in their town for the
rest of their lives. She decided to conduct another poll
asking the same question, and again found that 60% of the
people in the second poll were planning to live in their town
for the rest of their lives.
If both polls had a confidence level of 90% (z*-score of
1.645), and the margin of error was 3 times greater in the
second poll, approximately how many people were
surveyed in the second poll?
E = z*
p(1-P) n = (1 – ).(
n
30 people
90 people
810 people
2,430 people