Which statement best describes the aim of the study investigating loudness and dysarthria?

• A. To examine the relation of vocal loudness production to selected acoustic variables known to inform listeners of phrase and sentence boundaries: specifically, F0 declination and final-word lengthening.
• B. To assess overall intelligibility changes with loudness
• C. To compare loudness effects between men and women
• D. To measure articulation rate changes with loudness

Answer: (C)

When researchers look at loudness and dysarthria, they often want to know whether the effects of changing loudness differ across groups, such as between men and women. The best description of the aim here is that the study compares how loudness affects speech between genders. This focus on gender differences is what makes it a distinct question from simply linking loudness to particular acoustic features, measuring overall intelligibility changes with louder speech, or tracking changes in articulation rate as loudness varies. Those other aims would address different aspects of how loudness influences speech, not whether the effect itself differs by gender, which is the core idea this question is testing.