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A research psychologist hypothesizes that people expressed more positive emotions during the 1990s than the 2010s. To test this, she analyzes the emotional tone of millions of pre-existing newspaper articles published during those decades. Because she is analyzing pre-existing data that were originally collected for some other purpose, rather than actively gathering new data from participants, she is conducting ____ research.

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Updated 2026-06-14

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Research Methods in Psychology - 4th American Edition @ KPU

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