| Step 1. |
How many people are there in the population you are choosing your sample from? If unsure use 25,000. The built-in finite population correction factor will decrease the sample required if the population is small. |
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What is the population size? |
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| Step 2. |
The margin of error determines how close to the population proportion you would like the estimate to be (for example, +/- 5%). |
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What margin of error can you tolerate? |
%
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| Step 3: |
A confidence level of 95% establishes an interval that would be expected to contain the true value at least 95% of the time. Common choices are 90%, 95% or 99%. |
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What level of confidence would you like? |
%
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| >Step 4: |
If you have a previous estimate of the population proportion enter it here. Use a value between 0 and 100%. It is best to use 50% if unsure. |
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What is the best estimate of the population proportion? |
%
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| Sample Size you would need to achieve your goal |
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| If your sample size is your margin of error would be |
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