Describe threats to internal validity (for example, history, maturation, testing, instrumentation, statistical regression, experimental mortality, and selection-maturation interaction, as appropriate to the study)
Part 1: Quantitative Component: Review and synthesize studies related to the key independent, dependent, and covariate variables to produce a description and explanation of what is known about the variables, what is controversial (i.e., mixed findings by researchers), and what remains to be studied. Part 2: Review and synthesize studies related to the research questions. Part 3: Qualitative Component: Review and synthesize studies related to the key concepts and/or phenomena under investigation to produce a description of what is known about them, what is controversial, and what remains to be studied. Part 5: Review and synthesize studies related to the research questions and why the approach selected is meaningful. Part 6: Describe threats to external validity (for example, testing reactivity, interaction effects of selection and experimental variables, specificity of variables, reactive effects of experimental arrangements, and multiple-treatment interference, as appropriate to the study) and how they will be/were addressed. Part 7: Describe threats to internal validity (for example, history, maturation, testing, instrumentation, statistical regression, experimental mortality, and selection-maturation interaction, as appropriate to the study) and how they will be/were addressed. Part 8: Describe any threats to construct or statistical conclusion validity
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