What is a one-tailed and two-tailed test?
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A one-tailed test checks for a statistically significant effect in only one direction, while a two-tailed test checks for significance in both directions.
- One-tailed test: Tests for an effect in only one direction (e.g., µ > µ₀).
- Two-tailed test: Tests for an effect in both directions (e.g., µ ≠ µ₀).