Professor Hoffman Was Interested in the Effects of Vitamin B12

question 372

Multiple Choice

Professor Hoffman was interested in the effects of vitamin B12 deprivation on learning. One group is given vitamin B12 in a box labelled "Vitamin X." The comparison group is given a sugar pill in a plain white box. He finds that the vitamin group learns lists of words faster and concludes that B12 affects learning. What's wrong with this experiment?

• A)It is confounded because of a possible experimenter bias effect.
• B)There were demand characteristics present in the study.
• C)It is confounded because there was no random assignment.
• D)It is confounded because the study cannot be replicated.
• E)There is nothing wrong with this experiment.

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Definitions:

-esis

-esis is a suffix used in medical terminology to indicate an action, process, or condition, often used to describe pathological conditions.

Serum

The liquid part of blood that remains after clotting has occurred, devoid of cells and fibrinogen but full of proteins and antibodies.

Fluid

A substance that flows and is not solid, including liquids and gases.

Surgical Puncture

A medical procedure involving the piercing of the skin or other tissue with a sharp instrument for diagnostic or therapeutic purposes.