11/19/2015copyright ed lipinski and mesa community college, 2003-2009. all rights reserved. 1...
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04/21/23 Copyright Ed Lipinski and Mesa Community College, 2003-2009. All rights reserved.
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Research MethodsSummer 2009
Choosing a Research Design
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Agenda
• General Housekeeping
• Assignments
• Lesson Objective
• Ed’s Overview / Discussion
• Questions.
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Objective
• “... to determine how to choose a research design”
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Ed’s Overview
• I. Functions of a Research Design
• II. Causal Versus Correlational
• III. Correlational Research
• IV. Experimental Research
• V. Internal and External Validity
• VI. Research Settings.
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I. Functions of a Research Design
• Focus of Research• Exploratory Data Analysis• Hypothesis Testing.
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II. Causal Versus Correlational
• A. Causal Relationship• One Variable Directly Influences
Another• Causal-Comparative Research• Preferred Methodology
• B. Correlational Relationship• Variable Changes Are Related
• C. Difference Is Degree of Control.
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III. Correlational Research
• A. Characteristics• B. Example of Such• C. Causation and Correlation
• Third Variables• Directionality
• D. Why Correlational?• Data Gathering• Inability to Manipulate• Naturally Occurring Variables.
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III. Correlational Research
• E. Simple Correlation• Relationship Between Weather and
Mood• “Measure” the Weather• Measure Mood• Calculate the Pearson r.
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III. Correlational Research
• Measuring Mood (Scale of 1 to 5)• Happy / Sad• Active / Passive• Unfriendly / Friendly• Bad / Good• Busy / Lazy• Unsatisfied / Satisfied• Kind / Cruel.
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IV. Experimental Research…
• A. Characteristics• B. Example of Such• C. Strengths and Limitations• D. Experiments Versus Demonstrations.
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IV. Experimental Research
• A. Characteristics• Independent Variable• Treatments• Dependent Variable• Experimental Group• Control Group• Extraneous Variables.
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IV. Experimental Research
• B. Example of Such• How could we carry out BBVM
Research?• Manipulation of the I.V.• Control Over Extraneous• Other Potential Confounds.
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IV. Experimental Research
• C. Strengths and Limitation• Identify Causal Relationships• Can’t Be Used w/o I.V. Manipulation• Causal – Comparative Research• Control Over Extraneous Variables.
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IV. Experimental Research
• D. Experiments Versus Demonstrations• Experiment w/o I.V.• Good To Examine Conditions• Example
• What makes this a demonstration?• What can be concluded?• How could this be an experiment?• What are potential hypotheses?.
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V. Internal Versus External Validity
• A. Internal Validity• Test What It Should• I.V. Caused the D.V.• Correlation, Not Extraneous• Confounding• Threats To Internal Validity• Enhancing Internal Validity.
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V. Internal Versus External Validity
• B. External Validity• Measure Is Consistent• Threats To External Validity
• C. One Versus The Other• Tend To Be Inversely Proportional• Which Is More Important• Large N, Good Controls.
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VI. Research Settings
• A. Laboratory Setting (Simulations)• B. Realism• C. Field Experiments.
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Recap
• I. Functions of a Research Design
• II. Causal Versus Correlational
• III. Correlational Research
• IV. Experimental Research
• V. Internal and External Validity
• VI. Research Settings.
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Choosing a Design
Questions