In Creating Groups of Subjects for an Experimental Study, Which

question 4

Multiple Choice

In creating groups of subjects for an experimental study, which one of the following procedures would MOST likely produce random groups for a class of thirty students?

• A) A coin is tossed in order to select students alternately one by one into the experimental and control groups.
• B) The first ten students who enter the classroom are placed into the experimental group and the next ten into the control group.
• C) The first twenty volunteers are selected from the physics class and alternately placed into experimental and control groups.
• D) The twenty students with the highest GPAs are selected and alternately placed into experimental and control groups.

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Definitions:

Gram-negative Organisms

Bacteria characterized by their cell wall composition, which stains pink with the Gram staining method and can cause various infections.

Flossing

The act of using a thin thread to remove food and plaque from between teeth to maintain oral hygiene and prevent gum disease.

Plaque

A deposit of fatty and other substances that builds up in the inner lining of arteries, leading to atherosclerosis and potential blockage.

Waxed Floss

Dental floss coated with wax to facilitate easier sliding between teeth for the removal of plaque and food particles.