A researcher wanted to systematically investigate the effectiveness of restraint on reducing challenging behaviors in a student with intellectual disabilities. She used a standardized scale to quantify challenging behavior. She took a baseline, introduced the restraint protocol, removed the restraint protocol, and then re-introduced the restraint protocol. She quantified challenging behaviors observed at each of those four time points. Which type of design best describes this scenario?  a) ABA Reversal Design b) ABAB Reversal Design c) Multiple-Baselines design

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12. A researcher wanted to systematically investigate the effectiveness of restraint on reducing challenging behaviors in a student with intellectual disabilities. She used a standardized scale to quantify challenging behavior. She took a baseline, introduced the restraint protocol, removed the restraint protocol, and then re-introduced the restraint protocol. She quantified challenging behaviors observed at each of those four time points. Which type of design best describes this scenario? 

a) ABA Reversal Design
b) ABAB Reversal Design
c) Multiple-Baselines design — across subjects
d) Multiple-Baselines design — across behaviors
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