Abdul Has Volunteered to Participate in an Experiment Evaluating the Effectiveness

question 271

Multiple Choice

Abdul has volunteered to participate in an experiment evaluating the effectiveness of aspirin.Neither he nor the experimenters know whether the pills he takes during the experiment contain aspirin or are merely placebos.The investigators are apparently making use of

• A) naturalistic observation.
• B) a confounding variable.
• C) the double-blind procedure.
• D) random sampling.

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Definitions:

Hyperextension

An excessive extension of a limb or joint beyond its normal range of motion, potentially resulting in injury.

Elevation

The upward movement of bones or body parts, typically referring to movement in a superior direction.

Extension

The movement that increases the angle between two body parts, such as straightening a flexed knee.

Plantar Flexion

The movement of the foot that increases the angle between the foot and the shin, as in standing on tiptoe.