Nonexperimental and quasi experimental design 3.1

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Unformatted text preview: Click to edit Master subtitle style 6/3/11 Nonexperimental and Quasi-Experimental Research Methods PSYC E226 3/1/10 6/3/11 Learning Objectives Understand the difference between experimental design and quasi or nonexperimental design. Identify and describe three nonequivalent control group designs Identify and describe two pretest-posttest designs Identify and describe two developmental designs 6/3/11 Narrowing Down Earlier we learned about five research strategies: Experimental Quasi-Experimental Nonexperimental Correlational Descriptive Today we will focus on two of them. What are: Quasi-experimental 6/3/11 How do they differ? In Experimental Design, the researcher manipulates the independent variable actively In Quasi- and Nonexperimental designs, the researcher uses already existing groups or time to see differences between groups Think about your research ideas. Can you do experimental research? Why or why not? 6/3/11 Nonequivalent Group Design Nonequivalent group design is when the researcher finds already existing groups Non-experimental : Comparing truancy rates at a school where a truancy prevention program is in place and a control school This is a type of between-group design What are the IV and DV in this example? What is the hypothesis? 6/3/11 Types of Nonequivalent: Differential Research Differential Research Design : Comparing two types of existing groups on a single variable Do college students show higher rates of anxiety and depression than other people that age? Already existing groups are not manipulated by the researcher, so this is non-experimental Similar to correlational design, but differential splits people into two groups, and looks for difference rather than finding how much the two categories relate 6/3/11 Types of Nonequivalent: Post-test Only Control Two similar groups are identified One gets a treatment Both groups are measured (one time only) The two measurements are compared The control group is usually similar but not equivalent they are not randomly assigned to that group Assumes that pre-test scores would be similar 6/3/11...
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