RBT Measurement and Data Collection 2 — Questions and Answers
Question 1: Whole interval recording scores a behavior as occurring only if:
- The behavior occurs at any point during the interval
- The behavior occurs throughout the entire interval (Correct answer)
- The behavior occurs at the end of the interval
- The behavior occurs at least 50% of the interval
Correct answer: The behavior occurs throughout the entire interval
Whole interval recording requires the behavior to occur for the entire duration of the interval to be scored as occurring. If the behavior stops at any point during the interval, it is scored as not occurring for that interval.
Question 2: Which measurement is calculated by dividing the number of responses by the time period?
- Duration
- Latency
- Rate (Correct answer)
- Percentage
Correct answer: Rate
Rate (or frequency per unit of time) is calculated by dividing the count of responses by the observation time. For example, 20 responses in 10 minutes = a rate of 2 responses per minute. Rate allows comparison across sessions of different lengths.
Question 3: An RBT is collecting trial-by-trial data during a discrete trial session. What is being recorded?
- The duration of each trial
- Whether the response on each trial was correct (+) or incorrect (-) (Correct answer)
- The inter-trial interval length
- How long the session lasted
Correct answer: Whether the response on each trial was correct (+) or incorrect (-)
Trial-by-trial data involves recording the outcome of each individual trial, typically as correct (+) or incorrect (-). This provides a detailed picture of the learner's performance and allows for calculating percentage correct.
Question 4: Percentage correct is calculated by:
- Dividing correct responses by total responses and multiplying by 100 (Correct answer)
- Dividing total responses by correct responses
- Multiplying correct responses by total responses
- Dividing correct responses by the session duration
Correct answer: Dividing correct responses by total responses and multiplying by 100
Percentage correct = (number of correct responses / total number of responses) × 100. For example, 8 correct out of 10 trials = (8/10) × 100 = 80%. This is commonly used to measure skill acquisition progress.
Question 5: Which type of data collection would be most appropriate for measuring how long a child's tantrum lasts?
- Frequency recording
- Duration recording (Correct answer)
- Partial interval recording
- Trial-by-trial data
Correct answer: Duration recording
Duration recording is most appropriate when the concern is how long a behavior lasts. Tantrums vary in length, and knowing the duration helps determine whether interventions are reducing the length of tantrum episodes.
Question 6: What is interobserver agreement (IOA)?
- A contract between the RBT and the BCBA
- A measure of the extent to which two independent observers agree on the occurrence of behavior (Correct answer)
- A type of reinforcement schedule
- A teaching procedure
Correct answer: A measure of the extent to which two independent observers agree on the occurrence of behavior
Interobserver agreement (IOA) measures the degree to which two or more independent observers record the same data for the same behavior during the same observation period. High IOA suggests the behavioral definition is clear and data are reliable.
RBT Measurement and Data Collection 2
Whole interval recording scores a behavior as occurring only if: