In Conducting a Randomized Comparative Experiment,an Experimenter Will Often Include

question 69

Multiple Choice

In conducting a randomized comparative experiment,an experimenter will often include a group of subjects,known as a control group,to receive a fake treatment.What is/are the reason(s) such a control group might be included in the experiment?

• A)To increase the number of subjects and hence increase the sensitivity of the experiment in detecting effects of the treatment
• B)To gain more complete understanding of any biases that might be present in the experiment
• C)To enable the experimenter to control the effects of outside variables,such as lurking variables,on the outcome of the experiment
• D)To repeat the experiment over a greater number of experimental subjects
• E)To enable the experimenter to more easily make a random assignment of subjects to the groups

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Definitions:

Schematic

A simplified representation of a system or circuit that uses symbols and lines to illustrate structure or function without showing actual layout.

Thread Representation

A standardized way of depicting the thread on fasteners or tapped holes in technical drawings, indicating form, pitch, and diameter.

Set Screws

Fasteners designed to pass through a threaded hole in one object to tighten against another, securing them together without protruding from the surface.

International Organization for Standardization

An independent, non-governmental international organization that develops standards to ensure quality, safety, and efficiency of products, services, and systems.