Sample Size for a Mean (Descriptive)

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Formula

Sample Size for a Mean (Descriptive)

n=Z2Γ—Οƒ2d2n = \frac{Z^2 \times \sigma^2}{d^2}

Where:

  • n = required sample size
  • Z = Z-score (e.g., 1.96 for 95% confidence)
  • \sigma = expected standard deviation
  • d = desired margin of error (precision)

Power Analysis Visualization

Legend Power Curve
Legend Selected (N=100, Tooltip Power 51.6%)