A Researcher Wants to Compare the Performance of Three Types

question 50

Multiple Choice

A researcher wants to compare the performance of three types of pain relievers in volunteers
Suffering from arthritis. Because people of different ages may suffer arthritis of varying degrees of
Severity, the subjects are split into two groups: under 60 and over 60. Subjects in each group are
Randomly assigned to take one of the medications. Twenty minutes later they rate their levels of
Pain. This experiment …

• A) has two factors, medication and age.
• B) has one factor (medication) blocked by age.
• C) has one factor (age) blocked by medication type.
• D) uses matched pairs.
• E) is completely randomized.

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Definitions:

Selective Advantage

A genetic or behavioral characteristic that improves an organism's ability to survive and reproduce in its environment.

Oxygen

A chemical element with symbol O and atomic number 8, essential for aerobic respiration in living organisms and a component of the Earth's atmosphere.

Multicellular Eukaryote

An organism made up of multiple cells that have a nucleus and organelles, including animals, plants, and fungi.