Final answer:
The statement in question is false because teachers should intervene when there is sabotage in group activities to ensure a successful and conducive learning environment.
Step-by-step explanation:
The statement "If one or more students sabotage the group contingency, the teacher should never intervene; the children will work it out themselves" is false. It is important for teachers to monitor group dynamics and address any issues that arise, such as student sabotage. In an educational environment, teachers play a crucial role in facilitating group work and ensuring that all students are able to participate and learn effectively.
Ignoring problems within group contingencies can lead to negative outcomes, such as the reinforcement of a self-fulfilling prophecy, where students might live up to negative expectations imposed on them, rather than positive ones.