Mathematics A-Level
One-tailed and two-tailed tests
What One-tailed and two-tailed tests means in Mathematics A-Level, as defined for AQA.
Definition of One-tailed and two-tailed tests
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Reference: AQA
For a one-tailed test the probability is compared to the significance level α; for a two-tailed test the observed tail probability is compared to α/2.
Topics that use One-tailed and two-tailed tests
- O: Statistical hypothesis testing (AQA A-Level)
Related terms
- Binomial distribution
- binomial hypothesis testing
- Correlation interpretation
- critical region
- Hypothesis testing
- Normal hypothesis testing
- Null hypothesis (H₀)
- p-value
Using One-tailed and two-tailed tests in the exam
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