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A presentation for EDLD 750B

Susan Glassett

on 6 May 2010

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Transcript of Experiments

Experiment Control
Group Random
Selection Quasi Experiment a true experiment requires Sampling Convenience Sampling Snowball Sampling non-probability sampling make it a Experimental Design As described by You use an experiment when you want to establish a
cause and effect independent variable dependent variable selecting participants
who are willing and
available using an intermediary Dr. Prada-Olmos
says this is not possible
in education so we use or Experimental
Group do not manipulate
independant variables change independent
variables Threats to Validity Threats to
internal validity Threats to
external validity diffusion of treatments
compensitory equalization
compensitory rivalry
resentful demoralization
related to treatments related to procedures testing
instrumentation interaction of treatment and
history related to participants history
interaction with selection
What are the steps
in conducting
research? Does the experiment address
your research problem? What is the hypothesis to
test the cause-and-effect
relationships? What is the experimental unit?
Who are the study participants? What is the experimental treatment?
Have you introduced it? What is the experimental design? Are all the steps to conducting
the experiment completed? How is the data organized?
What is the analysis of the data? Has the format for the experimental
research report been developed? Types of Experiments True
Experiment Quasi
Experiment Factorial Repeated
Measures Two or more
groups or
individuals Between-Group
Designs 2 or more
interventions Time Series Within-Group
Designs Interrupted time series Equivalent Time Single Subject A/B
Multiple Baseline
Alternating Treatments Control Over
Extraneous Variables Pretests & posttests


Matching of participants

Homogeneous samples

Blocking Variables
Treatment Variables

Conditions - levels within the variables

Intervening in the treatment conditions

Manipulating Treatment
Conditions ensuring that characteristics
of participants that may
influencethe outcome are equally
represented in each group variables that relate to
the dependent variable

statistically controlled variables controlled before
the experiments starts using
subgroups 8 1 2 3 4 5 6 7
Full transcript