Frequently Asked Questions
What is the central limit theorem?
The sampling distribution of the sample mean is approximately normal with mean μ and SD σ/√n, for sufficiently large n, regardless of the population's shape.
How large should n be?
Rule of thumb: n ≥ 30 for moderately non-normal populations. Heavily skewed populations may need more.
Is this different from a z-test?
Same z-statistic, different framing. This calculator asks for the probability; a z-test calculator asks for the decision at α.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.