Question

a. in a designed experiment, what are the experimental units?
b. if the experimental units are humans, what term is often used in place of experimental unit?
a. choose the correct answer below
a. the individuals or items on which the experiment is performed
b. the group receiving the specified treatment
c. the group receiving placebo
d. the experimental conditions

Explanation:

Part a

To determine the correct definition of experimental units, we analyze each option:

• Option A: Experimental units are indeed the individuals or items on which the experiment is performed. This matches the definition of experimental units.
• Option B: The group receiving the specified treatment is the treatment group, not experimental units.
• Option C: The group receiving a placebo is the placebo group, not experimental units.
• Option D: Experimental conditions refer to the settings or factors of the experiment, not the units.

When experimental units are humans, the term "subjects" is commonly used instead of "experimental units" in the context of experiments (especially in fields like medicine, psychology, etc.). This is a standard terminology shift when the experimental units are people.

Answer:

A. The individuals or items on which the experiment is performed

Part b