Examlex
An amniocentesis samples the placenta to determine chromosomal abnormalities and genetic disorders.
Random Sample
A sample drawn from a population in such a way that every individual has an equal chance of being selected.
Blood Type
The classification of human blood based on the presence or absence of antibodies and inherited antigenic substances on the surface of red blood cells.
Association
In statistics, it refers to any relationship or correlation between two or more variables.
Null Hypothesis
A default statement in statistics that there is no significant effect or no difference, usually set as the assertion to be tested.
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