0.4 correlational research methods

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7 Terms

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correlational research

examines relationship between two or more variables without intervention

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third variable problem

possibility that a third unknown variable is influencing a relationship between two variables

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scatterplot

visual representation of a relationship between two variables

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correlation coefficient

statistical measure used to express the strength of a relationship between two variables (symbol = r; ranging from -1 to 1)

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no correlation

no relationship between two variables (r = 0)

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positive correlation

if one variable changes, the other variable changes in the same way (r > 0)

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negative correlation

if one variable changes, the other variable changes in the opposite direction (r < 0)