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Problem identification. Research questions Constructs & Variables Research design. Randomized experiments. Controlling and manipulating variables Random assignment Independent vars vary within and between subjects Threats to internal validity Selection / selection by maturation Maturation

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## Problem identification

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**Problem identification**Research questionsConstructs & VariablesResearch design**Randomized experiments**• Controlling and manipulating variables • Random assignment • Independent vars vary within and between subjects • Threats to internal validity • Selection / selection by maturation • Maturation • History • Instumentation • Mortality**Classification of research**Experimental • Quantitative • Experimental • Non-experimental • Correlational • Ex Post Facto • Longitudinal / Cross-sectional / Cohort sequential • Survey • Natural / systematic observation • Meta-analysis • Qualitative (negative case analysis) • Phenomenology • In-depth interview • Ethnografic • Participant observation • Case study Descriptive**Basic research designs**Research Design Exploratory Research Design Conclusive Research Design Descriptive Research Causal Research Survey Data Observational & Other Data Experimental Data**Experimentation as Conclusive Research**Conclusive Research Descriptive Causal Experimentation Field Experiments Laboratory Experiments**A Classification of Experimental Designs**Experimental Designs Statistical FactorialDesign • Pre Experimental • One-Shot Case Study • One Group Pretest- • Posttest • Static Group • True Experimental • Pretest-Posttest Control Group • Posttest-Only Control Group • Quasi-Experimental • Time Series • Multiple Time Series

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