What was Oskar Pfungst's evidence that Clever Hans was not doing math?
A)Hans's answers were only slightly more accurate than chance.
B)Hans guessed randomly when scientists were present.
C)Hans answered correctly only when his trainer, Mr. von Osten, was present.
D)Hans answered correctly only if the questioner knew the correct answer.

Question

What was Oskar Pfungst's evidence that Clever Hans was not doing math?​
A)Hans's answers were only slightly more accurate than chance.
B)​Hans guessed randomly when scientists were present.
C)​Hans answered correctly only when his trainer, Mr. von Osten, was present.
D)​Hans answered correctly only if the questioner knew the correct answer.

Quizplus · Accepted Answer

Pfungst discovered that Hans could only answer correctly if the questioner knew the correct answer, suggesting that Hans was not actually performing math but rather picking up on subtle cues from his trainer and questioners.

What Was Oskar Pfungst's Evidence That Clever Hans Was Not