Lecture Conducting and reading research in health and human performance (4/e): Chapter 8 - Ted A. Baumgartner, Larry D. Hensley

Chapter 8 - Experimental research. This chapter includes contents: Overview of experimental research, systematic procedures, steps in experimental research, research validity, internal validity, threats to internal validity, threats continued,. | Chapter 8 Experimental Research Overview of Experimental Research Traditional type of research Purpose is to investigate cause-and-effect relationships among variables Experimental groups vs. control groups Each group of participants receives a different treatment Always involves manipulation of the independent variable Answers the question “What will be?” Systematic Procedures More than any other type of research, experimental research should follow a definite, orderly procedure Specific steps follow . . . Steps in Experimental Research State the research problem Determine if experimental methods apply Specify the independent variable(s) Specify the dependent variable(s) State the tentative hypotheses Determine measures to be used Pause to consider potential success Identify intervening (extraneous) variables Formal statement of research hypotheses Design the experiment Final estimate of potential success Conduct the study as planned Analyze the collected data Prepare a research report Research Validity Internal Validity – the validity of findings with the research study; the technical soundness of a study, particularly concerned with the control of extraneous influences that might effect the outcome External Validity – the degree to which the findings can be inferred to the population of interest or to other populations or settings; the generalizability of the results Both are important in a study but they are frequently at odds with one another in planning and designing a study Internal validity is considered the basic minimum for experimental research Internal Validity . . . this is the basic minimum without which any study is not interpretable Particularly important in experimental studies Did, in fact, the experimental treatment (X) produce a change in the dependent variable (Y) To answer yes, one must be able to rule out the possibility of other factors producing the change To gain internal validity, the researcher attempts to control everything and . | Chapter 8 Experimental Research Overview of Experimental Research Traditional type of research Purpose is to investigate cause-and-effect relationships among variables Experimental groups vs. control groups Each group of participants receives a different treatment Always involves manipulation of the independent variable Answers the question “What will be?” Systematic Procedures More than any other type of research, experimental research should follow a definite, orderly procedure Specific steps follow . . . Steps in Experimental Research State the research problem Determine if experimental methods apply Specify the independent variable(s) Specify the dependent variable(s) State the tentative hypotheses Determine measures to be used Pause to consider potential success Identify intervening (extraneous) variables Formal statement of research hypotheses Design the experiment Final estimate of potential success Conduct the study as planned Analyze the collected data Prepare a research .

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