Examlex
If relevant characteristics of a population are known, a researcher can draw a ____ sample that may be more representative of the population than a simple random sample.
Ultrasound
The noninvasive therapeutic or diagnostic use of very high frequency sound waves for examination of internal body structures.
High-Frequency Sound Waves
Sound waves with frequencies higher than those audible to humans, used particularly in medical imaging and diagnostics.
Echoes
The sounds reflected back to the source by an obstruction, helping in determining the location of objects through echolocation or used in diagnostic tools like ultrasounds.
Barium Enema
A diagnostic imaging procedure that involves filling the colon with a barium solution to improve the visibility of the large intestine on X-rays.
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