2.2.4 - Directional (one-tailed) and non-directional (two-tailed) tests

2.2.4 Directional (one-tailed) and non-directional (two-tailed) tests and hypotheses.

Use - directional (one-tailed) and non-directional (two-tailed) tests to connect the rule to the data and decision in the question.

This matters because - directional (one-tailed) and non-directional (two-tailed) tests determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - directional (one-tailed) and non-directional (two-tailed) tests to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Directional (one-tailed) and non-directional (two-tailed) tests is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.