Multiple Choice
Dr. Hoff is curious as to whether children in a kindergarten classroom will be friendlier after talking about friendship. Immediately before and after the discussion, she has several undergraduate research assistants code the "friendliness" of a group of kindergarteners. Which of the following threats should Dr. Hoff be most concerned about?
A) History
B) Maturation
C) Instrumentation
D) Testing
Correct Answer:

Verified
Correct Answer:
Verified
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