"Clever Hans" Could Answer Math Questions Only Under Which Conditions?​

question 219

Multiple Choice

"Clever Hans" could answer math questions only under which conditions?​

• A)Only if he had heard the same question before
• B)​Only if his trainer was present
• C)​Only if he could see the questioner's face
• D)​Only if he could hear the questioner's voice

---

Definitions:

Milligram

A unit of mass equal to one thousandth of a gram, often used in medication dosages and nutritional information.

Gram

A metric unit of mass equal to one thousandth of a kilogram.

Millimeter

A metric unit of length equal to one thousandth of a meter.

Microgram

A unit of mass equal to one millionth of a gram, often used to measure very small quantities of medication.