Examlex
A researcher separated the people in a population into three political categories: Democrat, Republican, or Independent. She then selected a random sample from each of these three groups. What kind of sample did she select?
Widening
The process of making something broader or more expansive in size, scope, or extent.
Blood Pressure
The force that circulating blood exerts against the walls of blood vessels.
ECG
Electrocardiogram, a non-invasive test that records the electrical activity of the heart to assess its health and detect any abnormalities.
P Wave
The first wave in an electrocardiogram, representing the depolarization of the atria of the heart.
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