An exit survey of 500 voters revealed that 210 of them favor a particular referendum issue. 1. Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue.
An exit survey of 500 voters revealed that 210 of them favor a particular referendum issue. 1. Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue.
Solution
For a 90% confidence interval, use the formula;
