est and Posttest. The dependent variable will consist of students' scores on a standardized test of reading performance. So that the design may be fully understood, it is graphically depicted below in Figure 1.
_________________________________________________________________ TESTING
CLASS SIZE Pretest Posttest
----------------------------------------------------------------- N = 16 students
----------------------------------------------------------------- N = 24 students
-----------------------------------------------------------------
_________________________________________________________________
Figure 1: Graphic Depiction of the Research Design
Control Variables. Several variables can contribute to variance
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