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#1. A Board Certified Behavior Analyst (BCBA) instructs a Registered Behavior Technician (RBT) to collect whole interval data on a client’s ability to remain seated during a 20-minute group activity. The BCBA defines ‘remaining seated’ as the client’s buttocks continuously touching the chair surface. The RBT uses 20-second intervals for data collection. During a 5-minute observation period, the RBT records the following durations for ‘remaining seated’ within consecutive 20-second intervals Interval 1 18 seconds, Interval 2 8 seconds, Interval 3 19 seconds, Interval 4 12 seconds, Interval 5 19 seconds, Interval 6 15 seconds. Based on this whole interval data, how many responses should the RBT report for the ‘remaining seated’ behavior during this observation period?
Whole interval recording is a discontinuous measurement procedure where an observer records if the target behavior occurred throughout the entire duration of a predetermined interval If the behavior does not occur for the full interval it is not counted as a response In this scenario the target behavior remaining seated must occur for the entire 20second interval to be recorded as a response Reviewing the recorded durations 18 8 19 12 19 15 seconds none of these meet the criterion of occurring for the entire 20second interval Therefore the RBT should report 0 responses This example also highlights a common limitation of whole interval recording it tends to underestimate the actual occurrence of the behavior as partial occurrences are not counted even if the behavior was present for a significant portion of the interval While useful for behaviors you want to increase or when continuous measurement is not feasible its discontinuous nature means it doesnt always fully capture the true rate or duration of behavior
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