Z-Test Calculator

Perform Z-tests for hypothesis testing with known population standard deviation

Sample Mean (x̄):

Population Mean (μ):

Population Standard Deviation (σ):

Sample Size (n):

Test Type:

The Z-test is used when the population standard deviation is known and sample size is large (n > 30).

Formula: Z = (x̄ - μ) / (σ / √n)

Use this test to determine if a sample mean significantly differs from the population mean.

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This page is maintained as an educational calculator reference.

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Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.