When a researcher asks the question, Have changes in some developmental process within the subjects paralleled the treatment effects?, she is concerned with which one of the following potential threats to internal validity?
a. maturation
b. subject selection
c. regression effect
d. testing effect
Question 2
If you were studying the effects of success and failure on feelings of depression and all of the participants experienced the failure condition on a rainy Monday and the success condition on a sunny Wednesday, ______ might be a threat to internal validity.
a. maturation
b. history
c. subject selection
d. mortality
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