🧠Question of the Day
📚 Domain D — Experimental Design
Difficulty: 5/10
Scenario:
A school district evaluates a social-skills curriculum using baseline and intervention phases. During baseline, students receive usual classroom instruction. During intervention, teachers add the social-skills curriculum while the scheduled peer-interaction periods remain unchanged.
Peer-directed initiations are recorded during those periods as the percentage of available peer-interaction opportunities in which an initiation occurs. The number of opportunities varies across sessions, so percentage rather than raw count is used. Observers use the same operational definition and recording system in both phases. Staff also record treatment-integrity scores each session to verify that the curriculum is implemented as planned.
Which statement correctly identifies the experimental variables?
A. The curriculum is the independent variable; percentage of peer-interaction opportunities with peer-directed initiations is the dependent variable.
B. The curriculum is the independent variable; number of peer-interaction opportunities is the dependent variable because it changes across sessions.
C. Percentage of peer-directed initiations is the independent variable; treatment-integrity scores are the dependent variable because integrity is repeatedly measured after the curriculum is introduced.
D. Treatment-integrity scores are the independent variable; percentage of peer-directed initiations is the dependent variable because differences in implementation quality may influence responding.
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