Mary,who has trichotillomania (chronic hair pulling),is enrolled in a single-subject study using an ABAB design to see if she pulls more hair while watching TV.Mary watched TV during dinner for four weeks and pulled at least ten hairs a day for the four weeks.Then she left the TV off for four weeks and pulled only one hair per day for the four weeks.In the next step of this design,the experimenter should have Mary

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In an ABAB design, the B phase involves reversing the treatment or intervention. In this case, the treatment was turning on the TV during dinner, which resulted in Mary pulling more hair. Therefore, the experimenter should turn the TV back on for four weeks to observe if Mary begins pulling hair more frequently again. A, B, and D are not relevant to the study's question and do not follow the design of the study.

Mary,who Has Trichotillomania (Chronic Hair Pulling),is Enrolled in a Single-Subject