Subjective listening tests require repetition and randomization to be statistically valid

Evidence

On each loudspeaker one set of technical measurements is sufficient, but subjective tests must be repeated and randomized, and must involve several listeners to be statistically useful data. — Toole, Floyd E, Sound reproduction- the acoustics and…, 144

Categorization

• XREF: Core methodology behind double-blind audio evaluation, foundational to psychoacoustic testing standards. — connects to: Repeated familiar program excerpts make the most effective listening-test stimuli.; Randomizing identifiers, positions, and music prevents experimenter bias in listening tests; Blind listening tests make subjective sound judgments objective and repeatable — , Toole, Floyd E - Sound reproduction-…, 87 (+5 more)
• corroborated: 2 independent passages support this claim — Toole, Floyd E, Sound reproduction- the acoustics and…, 144

Broader Connections

• Randomizing identifiers, positions, and music prevents experimenter bias in listening tests #expands (0.85)
• Blind listening tests make subjective sound judgments objective and repeatable #corroborates (0.80) — , Toole, Floyd E - Sound reproduction-…, 87
• Pilot tests and controlled constants eliminate confounding in listening experiments #expands (0.80)
• Subjective speech ratings need at least sixteen listeners for statistical power #expands (0.75)