Can a minor be questioned and accused of a crime at school without parents being notified?

Yes, but, the minor can still demand the right to having an adult present before further questions are asked. Legally, questioning must then stop until the chosen person arrives.

Added: "Questioned" and "accused" are the key components of the question, but no information is given on who is doing the questioning and acccusing.

If it is a school administrator, that would be governed by the school administration's rules. Civilian school administrators are NOT law enforcement officers and their inter-actions with students do not fall under the purview of criminal procedure.

If done by a sworn law enforcment officer - the police dohave leeway to speak with minors regarding their actions without having to have a parent present.

It is when the questioning stage becomes the "accusatory" stage that most agencies require that a parent/guardian be notified and present.

When/If the situation is an arrest, and the juvenile is "in custody," parents/guardians MUST always be notified.