The advantage of including two treatment groups receiving the treatment at different times in a replicated interrupted time series design is that
a. the control group is not necessary.
b. the effect of a possible history threat to internal validity is more apparent.
c. you avoid have to engage in pretest-posttest measurements.
d. you can use counterbalancing to avoid maturation problems.
b
Psychology
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A) achieved B) foreclosed C) diffused D) delayed
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a. paranoid b. schizoid c. schizotypal d. borderline
Psychology