Mathematics A-Level
One-tailed and two-tailed critical regions
What One-tailed and two-tailed critical regions means in Mathematics A-Level, as defined for Pearson Edexcel.
Definition of One-tailed and two-tailed critical regions
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Reference: Pearson Edexcel
A two-tailed test at significance level α rejects H₀ if |z| exceeds z_(α/2), while a one-tailed test compares z with z_α in the correct direction.
Topics that use One-tailed and two-tailed critical regions
- Statistical hypothesis testing (Pearson Edexcel A-Level)
Related terms
- Binomial hypothesis tests for a proportion
- Contextual interpretation of significance
- Critical regions and p-values
- null hypothesis
- significance level
- Test statistic
- Alternative hypothesis
- Inference from sample to population
Using One-tailed and two-tailed critical regions in the exam
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