Lecture 6 PowerPoint

Lecture 6 PowerPoint - POL 2156B FOUNDATIONS OF RESEARCH...

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POL 2156B FOUNDATIONS OF RESEARCH RESEARCH DESIGN
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LECTURE PLAN Midterm Test Goals of a Research Design Randomized Controlled Experiments Research Ethics The Research Proposal (Part 2)
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WHAT IS A RESEARCH DESIGN? A research design is a plan that shows how a researcher intends to study an empirical question. It includes some (or all) of the following elements: Which specific theory and propositions will be tested (Hypotheses) What the units of analysis will be How variables will be measured How the information will be collected What procedures will be used to analyze the information
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PURPOSES OF A RESEARCH DESIGN Purposes of a research design: Exploratory: may not include hypotheses or measurements Descriptive: may not include hypotheses Explanatory: will typically include all elements We will concentrate on the last type: research designs to test hypotheses, precisely because it includes all of the elements.
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HYPOTHESIS-TESTING RESEARCH (EXPLANATORY) The goals of these designs are to: Establish that there is a relationship between two or more variables Demonstrate that the relationship exists in the real world (covariation: two variables move together) Reveal whether one phenomenon preceded another in time (time order) Eliminate alternative explanations (demonstrate the relationship is not spurious)
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AN EXAMPLE OF TWO VARIABLES THAT COVARY 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 Study Hrs / Wk Average Grade
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THE RANDOMIZED CONTROLLED EXPERIMENT Assign, at random, individuals to an experimental group or a control group. Those in the experimental group will receive a test stimulus, while those in the control group will not. There can be more than one experimental group receiving different stimuli Measure your dependent variable for all individuals in all groups (pre-test measure)
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Lecture 6 PowerPoint - POL 2156B FOUNDATIONS OF RESEARCH...

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