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A grocery researcher randomly chooses several geographic areas as primary sampling units, and then interviews a sample of grocery store owners within the chosen areas. Which type of sampling procedure does this represent?
Optical Microscope
An instrument that uses light and a system of lenses to magnify small objects, allowing them to be seen in detail.
Quality Control
The process of ensuring that products and services meet customer expectations and comply with standards, through regular reviews and tests.
Quality Assurance
Procedures that ensure that the services provided in the medical practice meet or exceed requirements and standards.
Medical Instrument
Tools or devices used in the practice of medicine for diagnosis, treatment, or surgery.
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