Examlex
What became a key component of the Underground Railroad in the 1850s?
Observing
The act of carefully watching someone or something, often to gain information.
Third Variable
A factor that is not directly involved in an experimental setting but that may affect the relationship between the independent and dependent variables.
Correlation Coefficient
A numerical measure that represents the strength and direction of a relationship between two variables, ranging from -1 to 1.
Placebo Effect
A phenomenon in which a person's condition improves because they believe they are receiving treatment, even though the treatment has no therapeutic value.
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