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RBT measurement practice test

Frequency, rate, duration, latency, IRT, interval methods, products and graphs. Answer first, then check what separates the choices.

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A focused subset of the 75-question mixed bank, not 13 additional unique items. Independent practice; no readiness prediction.

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What to look for

A count answers how many events occurred. Rate divides that count by observation time. Duration measures an episode from its defined onset to offset. Latency begins at a specified instruction or stimulus and ends at response onset. IRT needs explicit response-to-response anchors; do not assume the same anchors in every program.

Worked exampleA learner completes 18 responses in 12 minutes: 18 ÷ 12 = 1.5 responses/minute. A later count of 24 in 20 minutes is only 1.2/minute. The larger count does not mean the higher rate.

Common trap: Dividing minutes by responses produces time per response, not responses per minute.

Study the full measurement guide, or practice all six domains.

Check a rate calculation

Compare observations using responses per minute, not raw counts.

Read, check, revisit

Question-and-answer reference

Answers are available here for study. Use the interactive practice above if you want to answer before seeing the reasoning. These are not secure or official exam items.

1. A technician counts 18 desk taps in 12 minutes on Monday and 24 in 20 minutes on Tuesday. Which comparison adjusts for the different observation lengths?
  1. 1.5 taps/minute Monday and 1.2 Tuesday. — Correct
  2. 18 taps/minute Monday and 24 Tuesday.
  3. 42 taps/minute on both days.
  4. 0.67 taps/minute Monday and 0.83 Tuesday.

Divide each count by its own observation time. Tuesday has a larger count but a lower rate; comparing raw counts alone reverses that distinction.

  • B. These are counts, not counts per minute.
  • C. Pooling the counts does not compare the separate observations.
  • D. Those divisions reverse the required count/time formula.

BACB RBT Test Content Outline (3rd ed.) · Task A.6
LeBlanc et al.: Selecting Measurement Procedures · Rate; independent calculation 18/12 and 24/20

Item rpt75-v2-two-observation-windows · Question bank updated October 20, 2026.

2. A plan defines duration as time from the first vocalization until 5 consecutive quiet seconds; the quiet seconds are included. An episode begins at 10:04:20 and meets that ending rule at 10:05:05. What duration is recorded?
  1. 65 seconds.
  2. 45 seconds. — Correct
  3. 5 seconds.
  4. 40 seconds.

Use the stated onset and offset, including the five quiet seconds specified in this definition. The interval from 10:04:20 to 10:05:05 is 45 seconds.

  • A. Seconds must be carried across the minute boundary.
  • C. Five seconds is the offset criterion, not the whole episode.
  • D. Subtracting the quiet seconds contradicts this definition.

BACB RBT Test Content Outline (3rd ed.) · Task A.1
LeBlanc et al.: Selecting Measurement Procedures · Duration with explicitly stipulated offset

Item rpt75-v2-episode-total · Question bank updated October 20, 2026.

3. At 09:12:10 an RBT says “Open the folder.” The learner starts opening it at 09:12:17 and finishes at 09:12:21. The plan measures from the instruction to movement onset. What is the latency?
  1. 7 seconds. — Correct
  2. 17 seconds.
  3. 11 seconds.
  4. 4 seconds.

Latency ends at response onset, not completion. Subtract 10 from 17 within the same minute to obtain seven seconds.

  • B. The clock reading is not an elapsed interval.
  • C. Eleven seconds includes the time spent performing the response.
  • D. Four seconds measures opening duration after onset.

BACB RBT Test Content Outline (3rd ed.) · Task A.1
LeBlanc et al.: Selecting Measurement Procedures · Latency; instruction-to-onset anchor

Item rpt75-v2-latency-repeated-instruction · Question bank updated October 20, 2026.

4. An observation uses six 20-second whole intervals. Engagement occurs throughout intervals 1, 2 and 5, but stops for two seconds in each of the others. How many intervals meet the stated whole-interval rule?
  1. 3 of 6 intervals. — Correct
  2. 20 of 120 intervals.
  3. 6 of 6 intervals.
  4. 2 of 6 intervals.

Only intervals with engagement throughout qualify. The brief interruptions disqualify intervals 3, 4 and 6; this is an interval proportion, not response frequency.

  • B. Seconds and numbers of intervals are different units.
  • C. Any occurrence would be a partial-interval rule.
  • D. Three intervals are explicitly uninterrupted.

BACB RBT Test Content Outline (3rd ed.) · Task A.2
LeBlanc et al.: Selecting Measurement Procedures · Whole-interval scoring

Item rpt75-v2-whole-interval-boundary · Question bank updated October 20, 2026.

5. A timer sounds every 30 seconds. The observer records only whether the learner is seated at that exact signal, without checking what happened between signals. Which procedure is being used?
  1. Continuous duration recording.
  2. Partial-interval recording.
  3. Momentary time sampling. — Correct
  4. Whole-interval recording.

The observation is a snapshot at each scheduled instant. It does not establish how long seating lasted between checks.

  • A. Continuous duration requires tracking onset and offset.
  • B. Partial interval asks whether behavior occurred at any point.
  • D. Whole interval requires behavior throughout an interval.

BACB RBT Test Content Outline (3rd ed.) · Task A.2
LeBlanc et al.: Selecting Measurement Procedures · Momentary observation versus interval rules

Item rpt75-v2-momentary-sample · Question bank updated October 20, 2026.

6. An approved worksheet measure counts independently completed problems. An aide later fills three of the learner’s blank answers. What must the RBT resolve before treating the final worksheet as the learner’s permanent-product data?
  1. Whether the aide considers the worksheet satisfactory.
  2. Whether the worksheet is longer than yesterday’s.
  3. Whether all answers use the same pencil color.
  4. Which responses the learner completed independently. — Correct

A product must support the specific behavior being measured. Added answers cannot be credited as independently produced by the learner merely because the final page is complete.

  • A. An opinion does not recover response attribution.
  • B. Worksheet length does not identify who produced answers.
  • C. Pencil color does not establish independent completion.

BACB RBT Test Content Outline (3rd ed.) · Task A.3
LeBlanc et al.: Selecting Measurement Procedures · Permanent-product attribution; stipulated independent-response measure

Item rpt75-v2-product-attribution · Question bank updated October 20, 2026.

7. A graph shows counts of completed requests per observed session. Tuesday’s session was cancelled. What should the RBT do with Tuesday, following the organization’s missing-data convention?
  1. Enter zero because no requests were recorded.
  2. Copy Monday’s count to maintain a continuous line.
  3. Use the approved missing-observation notation. — Correct
  4. Enter the weekly mean as Tuesday’s observation.

A cancelled observation is missing evidence, not an observed zero. The graph should preserve that distinction using the approved notation.

  • A. Zero would imply an observation with no responses.
  • B. Copying a prior value fabricates Tuesday data.
  • D. An imputed mean is not an actual observation.

BACB RBT Test Content Outline (3rd ed.) · Task A.4
BACB RBT Ethics Code (2.0) · 2.02; accurate records

Item rpt75-v2-graph-missing-session · Question bank updated October 20, 2026.

8. A team needs a definition two observers can use for “leaving the table.” Which proposed definition is most observable and measurable?
  1. The learner is insufficiently motivated to remain seated.
  2. Both feet cross the marked floor line one metre from the table. — Correct
  3. The learner tries to avoid difficult activities.
  4. The learner becomes unwilling to finish work.

The boundary and observable action tell observers what to count. The other descriptions infer private states or a purpose without specifying a measurable event.

  • A. Motivation is not an operational definition of leaving.
  • C. Avoidance describes a possible function, not the response boundary.
  • D. Unwillingness is inferred rather than directly defined.

BACB RBT Test Content Outline (3rd ed.) · Task A.5
LeBlanc et al.: Selecting Measurement Procedures · Operational definitions

Item rpt75-v2-observable-definition · Question bank updated October 20, 2026.

9. There are 16 planned opportunities, but four are cancelled before instruction. Of the 12 delivered opportunities, nine meet the independent-correct criterion. The plan uses delivered opportunities as its denominator. What percentage is recorded?
  1. 133.3%.
  2. 56.25%.
  3. 75%. — Correct
  4. 25%.

Use nine independent-correct responses divided by 12 delivered opportunities, then multiply by 100. Cancelled opportunities do not enter this stipulated denominator.

  • A. Dividing opportunities by correct responses reverses the ratio.
  • B. Nine divided by 16 uses planned rather than delivered opportunities.
  • D. Twenty-five percent is the remaining error/prompted proportion here.

BACB RBT Test Content Outline (3rd ed.) · Task A.6
LeBlanc et al.: Selecting Measurement Procedures · Percentage; explicit eligible denominator

Item rpt75-v2-percent-eligible · Question bank updated October 20, 2026.

10. Four recorded episodes last 20, 35, 45 and 60 seconds. What is the mean episode duration?
  1. 45 seconds.
  2. 4 seconds.
  3. 160 seconds.
  4. 40 seconds. — Correct

Total duration is 160 seconds. Divide by the four episodes to obtain a mean of 40 seconds per episode.

  • A. Forty-five seconds is one observed episode.
  • B. Four is the episode count, not a duration average.
  • C. One hundred sixty seconds is the total, not the mean.

BACB RBT Test Content Outline (3rd ed.) · Task A.6
LeBlanc et al.: Selecting Measurement Procedures · Mean duration; 160/4

Item rpt75-v2-mean-duration · Question bank updated October 20, 2026.

11. A line graph of independent requests shows 2, 4, 5, 7 and 9 across five comparable sessions. What can the RBT describe directly from these observations?
  1. A stable level with no change across sessions.
  2. An increasing trend across the observed sessions. — Correct
  3. Proof that a particular reinforcer caused the change.
  4. Proof that the skill generalized to other settings.

The values rise across the observations. The pattern alone does not establish a causal mechanism or performance in settings that were not observed.

  • A. The recorded series is not flat.
  • C. A descriptive trend alone does not establish causation.
  • D. No other-setting observations are supplied.

BACB RBT Test Content Outline (3rd ed.) · Task A.7
LeBlanc et al.: Selecting Measurement Procedures · Trend versus causal interpretation

Item rpt75-v2-graph-trend · Question bank updated October 20, 2026.

12. Partial-interval data show behavior in 8 of 10 one-minute intervals. A coworker writes “eight responses occurred.” What is the measurement problem?
  1. Partial intervals always count exactly one response each.
  2. Interval data cannot be reported as a proportion.
  3. Eight positive intervals do not establish eight responses. — Correct
  4. The ten intervals must be converted to ten responses.

One interval can contain several responses. Eight positive intervals supports 80% of intervals with occurrence, not an event count of eight.

  • A. An interval can contain more than one occurrence.
  • B. A proportion of positive intervals is a valid descriptive summary.
  • D. Observation units cannot be relabelled as responses.

BACB RBT Test Content Outline (3rd ed.) · Task A.8
LeBlanc et al.: Selecting Measurement Procedures · Interval occurrence versus event frequency

Item rpt75-v2-sampling-limits · Question bank updated October 20, 2026.

13. A response ends at 14:30:08 and the next response begins at 14:30:23. This protocol defines IRT from one response’s end to the next onset. What interval is recorded?
  1. 31 seconds.
  2. 15 seconds. — Correct
  3. 8 seconds.
  4. 23 seconds.

The specified end-to-next-onset interval is 23 − 8 = 15 seconds. Stating the anchors avoids confusing response duration with the gap between responses.

  • A. Adding the readings does not calculate elapsed time.
  • C. Eight is the first offset reading, not the elapsed gap.
  • D. Twenty-three is an absolute clock-second reading.

BACB RBT Test Content Outline (3rd ed.) · Task A.1
LeBlanc et al.: Selecting Measurement Procedures · Explicit IRT anchors

Item rpt75-v2-interresponse-offset · Question bank updated October 20, 2026.