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Group
Pretest
Intervention
Posttest
G1 (Experimental)
O
1
X
O
2
G2 (Control)
O
3
–
O
4
•
G
1
represents the experimental group (student-centered environmental design).
•
G
2
represents the control group (traditional classroom design).
•
X
represents the independent variable: the change to classroom design.
•
O
1
and
O
3
represent the pretest administration.
•
O
2
and
O
4
represent the posttest administration.
table
by Leslie
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