one tailed and two tailed tests
What one tailed and two tailed tests means in Psychology A-Level, as defined for AQA, OCR.
Definitions of one tailed and two tailed tests
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Reference: AQA
Whether the hypothesis was directional (one-tailed) or non-directional (two-tailed) is one of the three things needed to find a critical value in a table.
Whether the hypothesis is for a one-tailed test or two-tailed test is information used to enter the extract from statistical tables.
A directional hypothesis is one tailed, while a non directional hypothesis is two tailed.
Topics that use one tailed and two tailed tests
- Handling data (AQA A-Level)
- Inferential testing (AQA A-Level)
- D.1 – handling data (OCR A-Level)
Related terms
- level of measurement
- co-variables
- content analysis
- correlation coefficients
- levels of measurement
- levels of significance
- measures of central tendency
- Meta-analysis
Using one tailed and two tailed tests in the exam
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