The results of carefully controlled observations of Clever Hans and his ability to solve math problems showed

The results of carefully controlled observations of Clever Hans and his ability to solve math problems showed

a. he could do math.
b. he could add, but he could not subtract.
c. he was cued by the owner looking up or down.
d. none of these could be determined by observation.

Clever Hans was cued by his owner to look up or down.
He did not know how to do math, nor did he know how to add or subtract.
Due the observation it was obvious that his owner was cuing him on what to do.


Science

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