We have conducted an election poll of 600 likely voters, collected as randomly as possible. The 95% confidence interval (CI) for those planning to vote for Senator Smith is about 55% +/- 4%. How many additional likely voters would we need to poll to reduce the CI width to +/- 2%? Hint - you do not need to calculate the exact value to answer this question.
- 600
- 1,200
- 1,800
- 2,400
- None of the above