chapter 10 common experimental research designs 10 chapter 10 introduction to educational research:...
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Chapter 10Common Experimental
Research Designs10Chapter 10
Introduction to Educational Research:
A Critical Thinking Approach
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Research Design
Researchers are designers, much like architects, creating different types of designs in their blueprints
Experimental Research Designs
Intervention or treatment known as a manipulation True experimental Quasi-experimental Single-subject
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
True Experimental Designs
Research using designs that incorporate one or more true independent variables (manipulation plus random assignment)
Strong for testing cause-and-effect relationships Randomized posttest control group design Randomized pretest-posttest control group design Randomized matched control group design
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Pre R T Post
Pre R C Post R= Random assignment T=Treatment C = Control Pre=Pre-test measurement Post=Post-test measurement after the
treatment i.e., the Results
Key
Timeline
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
(Non-R) T Post
New reading program, Principal of Adams just arbitrarily named 10 students, had them participate, and gave a post-test.
What can we say about the results?
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
R T Post New reading program, Principal of
Adams, randomly selected 10 students, had them participate, and gave a post-test.
What can we say about the results?
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
R T Post R C Post
New reading program, Principal of Adams, randomly selected and assigned 10 students to each group, had them participate, and gave a post-test.
What can we say about the results?
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
R Pre T Post R Pre C Post
New reading program, Principal of Adams, randomly selected and assigned 10 students to each group, administered a pre-test had them participate, and gave a post-test.
What can we say about the results? Gain scores
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
(Pre) M R T Post (Pre) M R C Post
New reading program, Principal of Adams, gives a pre-test to students. Using pre-test scores, matching pairs of students, random assignment to group. Each group similar composition with regard to the subject characteristic of the pre-test.
What can we say about the results?
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Pretest and Posttest
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Randomized Factorial Designs
Interaction effect Occurring in factorial designs when the influence of one
factor depends on the level or category of a second factor (e.g., a treatment affects males but not females). Keyword is “depends”
Main effect Occurring in factorial designs when the averages between
categories of one factor overall are different (e.g., females averaged over treatment and control groups score differently than males averaged over treatment and control groups). Keyword is "overall"
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Interactive Results of Spelling Test
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Graph of Interaction
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Noninteractive Results of Spelling Test
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Graph Revealing No Interaction
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Page 289 – Tournaki (2003)
Learning disabilities
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Tournaki (2003)
D&P Strat
LD
Non-LD
Basic Hypothesis
0
100
score
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Tournaki (2003)
D&P Strategy
LD
Non-LD
Basic Hypothesis
C60
100
Sco
re o
n a
ccu
racy
80
70
90
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Quasi-Experimental Design
A research design that incorporates a quasi independent variable (an independent variable manipulation without random assignment)
Matched comparison group design
Time-series design
Counterbalanced Quasi-experiment
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Possible Outcomes in a Time Series Quasi-experiment
Pre pre pre pre pre T post post post post post
Page 281
Shinn, 2008
Introduction to Educational ResearchChapter 10: Common Experimental Research Designs
Single-subject design A type of quasi-experimental research design using one subject to test all treatment and control conditions
over time
Level of
hypera
ctiv
ity baseline treatment
Baseline(control)
treatment
What do you conclude? Confident? Defensible?
Shinn, 2008