Examlex
The chi-square test involves comparison of the observed frequencies of the groups with the expected frequencies of the groups.
Venipuncture
The process of puncturing a vein with a needle to draw blood or administer medication directly into the bloodstream.
Discoloration
A change in color of the skin or surface, often indicating an abnormal condition or damage.
Vacuum Tube
An electronic device consisting of a sealed glass or metal enclosure containing electrodes used to control electron flow for amplifying, switching, or modifying a signal.
Needle
A slender, sharp instrument typically made of metal, used for injecting substances into the body or withdrawing fluids from it.
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