• Group Comparisons Research Designs
  • Experimental Research Design
    • X=Treatment
    • O=Observation (Test)
    • R=Random Assignment
  • Quasi-Experimental Design
  • Causal-Comparative Design (Ex Post Facto)
• Treats to Experimental Validity
  • Internal (see handout)
  • External
    • Ecological
    • Population
• Subject Characteristics
  • Constants
  • Variables
    • Independent
    • Dependent
    • Moderator
    • Extraneous
• Measurement Scales
  • Nominal
  • Ordinal
  • Interval
  • Ratio
• Review for Test