The formula for z obt for the sampling distribution of the mean is 
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Definitions:
Insight Therapies
Psychological treatments that focus on increasing patients' understanding of themselves and their issues.
Behaviour Therapies
A broad range of techniques used to change maladaptive patterns of behavior through the application of learning principles.
Biomedical Therapies
Treatments for mental health disorders that involve physiological interventions, such as medication, to correct or alleviate symptoms.
Psychoanalytic Therapists
Mental health professionals who use techniques rooted in psychoanalysis to explore unconscious conflicts driving psychological symptoms.
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