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Social Studies, 04.01.2020 06:31 rayisaiah3
To measure whether older people are calmer than younger people, a researcher gives 20-year-olds, 40-year-olds, and 60-year-olds a questionnaire. this research technique is called a(n): a. correlational study. b. longitudinal study. c. experiment. d. cross-sectional study.
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