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How to Calculate Sample Size

Find the sample size needed for statistical significance.

The Formula

n = (z×σ/E)²

The sample size formula uses the mathematical relationship: n = (z×σ/E)². Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the sample size calculation.
  2. 2Substitute your known values into the formula: n = (z×σ/E)².
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Sample Size Calculator to confirm your answer.

Related Topics

sample sizestatisticssurvey

Use the Interactive Calculator

Skip the manual math — get instant results with our free Sample Size calculator.

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