A peer reviewer evaluates a manuscript where the authors conclude: 'Because our study successfully rejected the null hypothesis (), we have provided strong and informative evidence that our intervention has a meaningful impact.' Evaluate this claim using the arguments against the informativeness of null hypothesis testing.
Question: A peer reviewer evaluates a manuscript where the authors conclude: 'Because our study successfully rejected the null hypothesis (), we have provided strong and informative evidence that our intervention has a meaningful impact.' Evaluate this claim using the arguments against the informativeness of null hypothesis testing.
Sample answer: The authors' claim is invalid because rejecting the null hypothesis is inherently limited in informativeness; it only asserts that the intervention's effect is nonzero without describing its actual magnitude. Since population relationships are rarely exactly zero anyway, simply confirming a nonzero effect does not evaluate whether the intervention's impact is practically meaningful or trivial.
Key points:
- Evaluates the claim as invalid/overstated because NHST rejection is uninformative on its own.
- Points out that rejecting the null only indicates a nonzero effect and lacks magnitude description.
- Notes that population relationships are rarely exactly zero, so null rejection is a low bar.
Rubric: Answers should evaluate the claim by pointing out that: 1. Rejecting the null hypothesis does not show the magnitude or importance of the effect. 2. Population relationships are rarely exactly zero, so rejecting the null is a weak hurdle that does not guarantee a meaningful impact.
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Research Methods in Psychology - 4th American Edition @ KPU
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