Experimental Design: Purposes and Pitfalls
Research Methods Tutorials
Graduate students in Bill Trochim's Program Evaluation and Research Design class at
Cornell University prepared tutorials for students new to social research methods. I will
be referring you to these in several of the chapter pages. Rather than link you to each of
the individual tutorials, I will simply provide one link to the list of tutorials. I
suspect that the content of Dr. Trochim's tutorials page will expand in subsequent
Tutorials related to Chapter 8 include Securing Internal Validity - How to
Avoid the Threats, Single Group Threats to Internal Validity, and Validity.
Validity Tutorial and Exercises.
Measures Simulation - this is an applet that lets you investigate differences between
independent groups and repeated measures (or paired samples) t-tests.
Squares - Applet to create up to 7x7 Latin squares.
Threats in Posttest Experiments - try to identify the validity threats and then
read about them.
Research Randomizer is a Web-based
tool for carrying out random sampling and random assignment.
Research Design Web Page
Bill Trochim has developed a web page on research design that includes both
experimental and quasi-experimental designs. This is an excellent resource.
Use the Google search engine to find additional information on related topics.