Mathematics A-Level
Z-test statistic
What Z-test statistic means in Mathematics A-Level, as defined for WJEC.
Definition of Z-test statistic
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Reference: WJEC
The standardised score Z = (X̄ − μ₀) / (σ / √n), compared to standard normal critical values or used to calculate the p-value.
Topics that use Z-test statistic
Related terms
- critical value comparison
- linear association test
- Normal mean hypothesis test
- population correlation ρ
- exclusion of formula derivation
- linear association scope
- non-linear relationships
- PMCC interpretation
Using Z-test statistic in the exam
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