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Methodological guidance, not a whiskey trial. Academy extension requires replication, randomized or counterbalanced order and controls appropriate to interactions.
The passage appears in an investigation of salting meat before cooking.
The author argues that recognizing error requires experiments in which relevant parameters are controlled, because that is how competing explanations are separated.
PDF sheet 79
Controlling parameters
Fresh audit: paraphrase checked against PDF79, essay10 Seasoning Steak (printed50); whole supplied text and visual survey complete. Passage calls for controlled parameters, not an exclusive one-variable experimental-design rule.
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