Agricultural researchers compared the effectiveness of a new organic bio-stimulant spray against a standard control on crop resilience.
They observed no significant difference in leaf chlorophyll levels (p>0.05p > 0.05p>0.05), but they found a highly significant increase in mean root biomass (p≤0.001p \le 0.001p≤0.001).
Explain why the researchers concluded that a Type I error was highly improbable in relation to the difference in mean root biomass.
121 exam-style questions on AQA A Level Psychology Inferential testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.