What is the average run length (ARL)until an 
control chart signals a false alarm if the control limits are set at ±2.5 standard errors from the centerline?
Definitions:
Catatonic Schizophrenia
A subtype of schizophrenia characterized by significant motor disturbances, from rigid immobility to excessive motor activity.
Manic Episode
A period of excessive euphoria, inflated self-esteem, wild optimism, and hyperactivity, often accompanied by delusions of grandeur and by hostility if activity is blocked.
Dysthymic Episode
A period characterized by a persistent mild depression that lasts for at least two years in adults or one year in children and adolescents.
Dissociative Episode
A temporary period of dissociation or disconnection from one's immediate surroundings or self, often seen in disorders like dissociative identity disorder.
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