For survey readers, pollsters and students, get a margin of error calculated from a sample size and response share, or check a reported figure against its assumptions. Compare two survey estimates and see how sample size and confidence level affect the range. You leave with the calculation, a plain-language interpretation and the limits to keep in mind when reporting it.
Margin of Error
Calculate and interpret a survey’s margin of error from its sample size and results.
Use Margin of Error
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What it writes
- Margin-of-error calculation
- Plain-language poll interpretation
- Comparison of two survey estimates
How to use it
Include the number surveyed, the result as a count or percentage, your confidence level and how respondents were selected. Those figures let you get a calculation with its key assumptions stated.
What you bring
- Sample size and response share
- Confidence level, if known
- Sampling method or population
- Know how respondents were selected
A good fit for
- Checking whether a poll’s margin of error matches its sample size
- Comparing two candidates’ survey results before sharing the poll
- Explaining a class survey’s confidence interval in a report
Ways to start
A few requests this Agent can handle.
A poll has 1,000 respondents, with 52% supporting the measure. What is the approximate margin of error at 95% confidence?
One survey found 48% support from 800 people; another found 52% from 900. Can I say support changed, using 95% confidence?
I surveyed 120 of 600 students, and 78 chose the new lunch menu. Calculate the margin of error at 95% confidence and explain the result.
Good to know
This workspace provides text assistance.
- Assessing whether a poll’s questions were biased
- Treating a convenience sample as representative
- Cannot verify recruitment, response rates or data quality
- Standard calculations assume random, independent sampling
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Use it as a draft to review and adapt. Verify calculations, facts, rights, and suitability before relying on it. Do not provide information you do not have permission to share.
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