# A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 9% margin of error at a 90% confidence level, what size of sample is needed?

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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 9% margin of error at a 90% confidence level, what size of sample is needed?

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Step 1

Given:

Margin of error (E) = 0.09

Confidence level = 90%

Since, the proportion of people that support her (p) is not given then it will be assumed as 0.5.

Step 2

The sample size could be calculated using the following formula:

Step 3

The sample size at 90% confidence ...

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