When researchers added a few drops of vinegar to a brand-name beer, the beer tasters dislike it only if they had been told they were drinking vinegar-laced beer. This best illustrates the impact of

Perceptual set                        

Explanation:

Perceptual set: In psychology, the term perceptual set is also referred to as perceptual expectancy, and is defined as the phenomenon that involves a specific predisposition through which a person is ought to perceive distinct things in a particular way.

Fundamentally, a person notices only a few aspects of a particular situation or object and hence ignores the other given details. It is said that a perceptual set tends to happen in every sense.

In the question above, the given statement best illustrates the impact of "perceptual set".

To provide guidance towards cultivating chi

Explanation:

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;

i'll just take the points xd