A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 3% margin of error at a 99% confidence level, what size of sample is needed? _____
Added by Jeremiah S.
Step 1
The Z-score, which is a measure of how many standard deviations an element is from the mean, for a 99% confidence level is approximately 2.576. Second, we need to know the standard deviation. In this case, since we are dealing with a proportion, we can use the Show more…
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