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Chapter 06 - Independent Groups Designs
Chapter 06
Independent Groups Designs
1. (p. 181-182) Identify and briefly define the three primary types of control used in experiments.
The three primary types of experimental control are: manipulation, holding conditions
constant, and balancing. Manipulation refers to controlling an independent variable, that is, by
manipulating the levels of an independent variable. Holding conditions constant involves
holding a potentially important factor (or factors) constant in an experiment to keep that factor
from confounding the intended independent variable. Balancing is the type of control used to
control individual differences variables; in the random groups design balancing is usually
accomplished by randomly assigning participants to conditions of the experiment.
2. (p. 193-194) Clearly and concisely describe how a researcher could minimize the likelihood of
selective subject loss in an experiment—be sure to include in your answer any risks that the
