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Exhibit 10-9: Identify the Threats to Internal Validity Illustrated in the Examples

Question 3

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Exhibit 10-9: Identify the threats to internal validity illustrated in the examples below.
-Refer to Exhibit 10-9.More low achievers than other students drop out of an individualized reading program designed to lead to gains in reading achievement.


A) experimental mortality
B) reactive effect of testing
C) statistical regression
D) maturation
E) instrumentation

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