Multiple Choice
A researcher trains observers to complete checklists while observing children's behavior on the schoolyard during recess.Over the course of the study,observers become more reliable in their observations.Any effect of a treatment in this study might be confounded with an ____________ threat to internal validity.
A) observation
B) instrumentation
C) additive
D) expectancy effect
Correct Answer:
Verified
Correct Answer:
Verified
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