If we wanted to experimentally test people's attitudes towards a person based on speech style, a well-established method we could use is:

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The matched-guise technique is a well-established method for experimentally testing people's attitudes towards a person based on speech style. It involves using the same speaker to deliver messages in different accents, dialects, or styles, without the listeners knowing it's the same person, to isolate the effect of speech style on attitudes.

If We Wanted to Experimentally Test People's Attitudes Towards a Person