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Just to add to Shutterbug's explanation-
For the study to be accurate the testers must be as objective as possible.
Their appearance might make you feel like not disclosing.
Their method of questioning might trigger a defensive position.
By approaching questions from different angles, they can almost see if you are reporting accurately, or inaccurately.
Necessary evil I guess when it comes to scientific studies. Tedious, but at least they pay!
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