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Uma variável pode ser definida como qualquer coisa capaz de ser classificada em duas ou mais categorias, e que pode ser observada, registrada e mensurada. Nesse contexto, todas as alternativas abaixo correspondem a fatores que podem ser elencados como variáveis de uma pesquisa científica. Porém, se todas estivessem inseridas em uma pesquisa, e apenas uma delas tivesse que ser definida como a variável independente, qual delas seria?​​​​​​​

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