What is the difference between a simple pretest-posttest design and an interrupted time-series design?
A) The time-series design uses multiple measures taken at several points in time both before and after the manipulation.
B) The simple pretest-posttest design uses a single measure at pretreatment and post-treatment.
C) The time-series uses a series of measures that are "interrupted" by the manipulation.
D) All of the above
Answer: D
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