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Proper identification and measurement of variables are fundamental to the quality, validity, and reliability of any research study. A variable is a characteristic, attribute, or phenomenon that can take different values among individuals, groups, or situations. Examples include age, income, education, gender, health status, motivation, job satisfaction, and academic achievement. Properly identifying variables enables the researcher to clearly define what is being studied, while accurate measurement makes it possible to collect meaningful and comparable data. The first importance of identifying variables lies in clearly defining the research problem. A research problem may involve several factors, and the researcher must distinguish between independent, dependent, intervening, _______ _______ ________ ______ ________.
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