Reducing the margin of error by half

Reference no: EM1387695

An exit survey of 500 voters revealed that 210 of them favor a particular referendum issue.

i. Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue.

ii. How many more voters should we include in the sample if we need to reduce the margin of error by half?

Reference no: EM1387695

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