Answer the following four questions: (1) What is maturation as a threat to internal validity? (2) What is history as a threat? (3) Does the one-group pretest–posttest research design control for maturation as a threat to internal validity? (4) Explain why or how your answer to Question 3 is true or false.
What will be an ideal response?
Ans: Maturation refers to normal growth over time, while history refers to changes during the treatment period that might change the target behavior. The one-group pretest–posttest design does not control for maturation as a threat to internal validity because it only measures client growth and does not have a method for taking maturation into consideration. You do not know, with this design, if clients have been growing over the period of time before treatment.
Learning Objective: 14-3: Describe the various threats to internal validity
Cognitive Domain: Comprehension
Answer Location: Threats to Internal Validity
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