Praxis Psychology 5391 Research Methods Practice Questions and Answers Experimental design ✅Must have internal, external, and ecological validity. Researchers manipulate an independent variable and measure a dependent variable to determine a cause -and-effect relationship Experimental methods should include both ✅quantitative and qualitative measurements factor analysis ✅An important development in quantitative methodolgy which is used to summarize a set of variables such as test questions, develop theories about positive and negative reactions to the test, and determine reliability of the content of the test questions. Qualitative data ✅Uses verbal data gathered from classroom instructors and observers. Information obtained from conversations, interviews, focus groups, personal journals, student artwork, computer docs, interactions recorded on video. Lab experiments ✅test a hypothesis in a controlled environment Experimental study ✅changes one variable in the environment Observational study ✅tries to change as little of the existing environment as possible Psychometrics ✅studies ways to measure individual differences in knowledge, ability, attitude, and personality Longitudinal study ✅observes a large group of individuals who were born around the same time over a long period of time cross -sectional study ✅Observes individuals of different ages cross -sequential study ✅combines longitudinal and cross -sectional methodologies by observing different age groups over a long period of time and noting similarities and differences in and among groups basic research ✅can also be called exploratory research because psychologist's intention is to gain additional knowledge or build on existing knowledge from previous research. SIMILAR to applied research because both rely on previous research as well as theoretical concep ts to build a basis for the hypotheses that will be explored in that
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