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

Question

Quizplus · Accepted Answer

Experimental mortality is the correct answer because it refers to the loss of participants over the course of a study, which can threaten the internal validity if the dropout rate is not random and in this case, more low achievers dropping out could bias the results.

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