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GROUP EXPERIMENTAL DESIGN Group
experimental designs can be of different forms. If there is only one
independent variable that can be manipulated, then a single-variable design is
used. If there are two or more independent variables, and at least one can be
manipulated, then a factorial design should be chosen. Single-variable design
This study is classified under three main headings depending on the degree of
control maintained on other variables: ·
True
experimental designs (high degree of control)
·
Quasi-experimental designs (medium degree of control)
Quasi-experimental design involves selecting
groups of subjects upon which a variable is tested without any random
pre-selection processes. For example, a class of pupils under study might be
arbitrarily divided by alphabetical selection or by seating arrangement
before the test is conducted
·
Pre-experimental
designs (low degree of control)
Factorial design This is
applied to determine if the effect of an independent variable out of two or
more variables can be generalized. A factorial design, in this sense,
indicates relationships between variables. It may be that while one variable
increases, the other one decreases, or an increase in one gives rise to the
other variable. For lessons on variables, please go to UNIT 1, Section 1
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