Dr. Evans was surprised that many of his participants scored much lower than expected on his pretest. When he observed a significant increase in scores on the posttest, he was cautious in attributing the effect to his treatment alone. Which of the following threats to internal validity was Dr. Evans concerned about?
A) instrumentation
B) selection
C) regression
D) testing
Correct Answer:
Verified
Q1: The experimental design that uses one group
Q3: Which of the following is NOT one
Q4: What is the proper order of the
Q5: What term is synonymous with internal validity?
A)
Q6: Experimental research methods are used _.
A) to
Q7: What is an example of a true
Q8: Which is a threat to external validity?
A)
Q9: What does the term ANCOVA mean?
A) analysis
Q10: In an experimental research study, which group
Q11: Susan has twelve subjects drop out of
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