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A province-wide sample survey is to be made. First, the province is subdivided into counties. Seven counties are selected at random and further sampling is concentrated on these seven counties. What type of sampling is this?
Schizophrenia
An acute psychological illness defined by abnormalities in perceiving, thinking, emoting, communicating, self-conception, and acting.
Childhood Nutrition
The dietary needs and considerations for promoting health and development in children.
Childhood Vaccinations
Immunization given to children at various stages of their early years to protect against serious, and sometimes deadly, diseases.
Antipsychotic Medications
Drugs used to treat psychiatric conditions by modifying brain chemistry to reduce psychotic symptoms.
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