Learning Objectives

After reading this chapter, you should be able to

  • „„Explain the difference between strong experimental research designs and quasi-experimental research designs.
     
  • „„Explain the limitations of quasi-experimental designs in making causal inferences compared to strong designs.
     
  • „„Explain the characteristics of the nonequivalent comparison-group quasi-experimental design and how to search for rival hypotheses that might explain the obtained results.
     
  • „„Explain the characteristics of the interrupted time-series designs.
     
  • „„Explain how the regression-discontinuity design assesses the effect of a treatment.
     
  • „„Explain how time-series and single-case research designs attempt to rule out confounding variables.
     
  • „„Explain how a treatment effect is demonstrated in single-case research designs.
     
  • „„Explain the limitations of each of the single-case research designs.
     
  • „„Recognize and understand the methodological issues in single-case research designs.