Suppose a researcher is performing an experiment on children. She tests the children on one level of the independent variable at the beginning of the school year, but cannot return to test the second level until mid-April, when the school year is almost completed. What threat to internal validity may be a problem?
a. History
b. Selection bias
c. Maturation
d. Experimenter bias
Question 2When 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 3If 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
Question 4The assumption that poverty causes level of performance in school suffers from
a. Problems in statistical construct validity
b. Ambiguous temporal precedence
c. Problems with maturation
d. Problems with history
Question 5The strength of the relationship between the independent and dependent variable is reflected in the measure of ____________
a. Reliability
b. Power
c. Effect size
d. External validity
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