Which threat to internal validity measures changes in respondent performance, such as fatigue, which cannot be credited to the treatment or intervention?
A) Instrumentation
B) Regression
C) Testing
D) Maturation

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The Answer of Which threat to internal validity measures changes in respondent performance, such as fatigue, which cannot be credited to the treatment or intervention?
A) Instrumentation
B) Regression
C) Testing
D) Maturation

Which Threat to Internal Validity Measures Changes in Respondent Performance