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An extraneous variable can become a confounding variable if it changes systematically along with the other variables being examined in a research study.
Knights of Labor
A significant American labor organization in the late 19th century, advocating for the rights of workers, including shorter workdays and an end to child labor.
Terrence V. Powderly
A leader of the Knights of Labor, a key labor organization in the United States during the late 19th century, which aimed to promote workers' rights and social reform.
African-Americans
An ethnic or racial group in the U.S. that has heritage from any of the African black racial groups.
Labor Movement
A social and economic campaign advocating for workers' rights and interests, including better pay, working conditions, and hours.
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