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Bertina is conducting a long-term study of intelligence, asking if it changes significantly as people age. In this study, intelligence would be considered a(n):

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In this study, intelligence would be considered a "variable".

There are three fundamental sorts of variables in scientific experiment. The 1st variable is known as the independent variable. This variable is the one that is controlled or changed by the researcher. The second sort of variable is the one that is watched or estimated in the analysis, and it is known as the dependent variable. And control variables, which must be held constant.

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