Click on the following links. Please note these will open in a new window.

Video Links

• t-Test for Related Samples 
  This YouTube video describes the formula for a t-test with related samples (repeated measures) by using an example     
• One Way Within Subjects (repeated measures) ANOVA 
  This YouTube video describes a one way within subjects ANOVA and uses example data in SPSS to illustrate how to conduct the analysis and interpret the output
• Solomon Four Group Design 
  A cartoon example is used in this YouTube video to illustrate the four groups utilized in the Solomon Four Group Design

Audio Links

• Podcast 11: Between and Within Design 
  Discussion of control subject variables through random assignment to condition and by using within subjects design. Also discusses carryover effects, practice effects, and fatigue effects
• Podcast 5: Experimental Designs
  Posttest only control group design, pretest posttest control group design, Solomons Four Group design, multilevel or one way design.

Web Resources

• Counterbalancing
  University of North Carolina at Chapel Hill website explaining the use, integration , and results interpretation of counterbalancing to offset carryover effect in within-subjects experimental designs
• Solomon Four-Group Design 
  Website explaining the uses, strengths, and drawbacks of the Solomon four-group design
• Threats to Internal Validity of Research 
  Gives a brief and easy to read overview of the various threats to validity