Type I And Type II Errors

  • Review Chapter 8 in your course text, Research Methods for the Behavioral Sciences. Pay particular attention to the difference between Type I and Type II errors.
  • Review the web article, “ Type I and Type II Errors—Making Mistakes in the Justice System.” Pay close attention to the descriptions and examples of Type I and Type II errors.
  • Using the Walden Library, select and review a research article that addresses a forensic psychology issue or takes place in a forensic setting, and that reports or discusses a Type I or Type II error.
  • Think about the possible consequences to the research study of making each type of error.
  • Consider whether the resulting consequences of making each type of error would be tolerable or not and why.

With these thoughts in mind:

Post by Day 4 a brief summary of the study you selected. Then, explain how and why the study reports the possibility of either a Type I or Type II error. Finally, explain the potential consequence to the research study of making either a Type I or a Type II error and which is more “ tolerable” and why.

Learning Resources


  • Course Text: Stangor, C. (2015). Research methods for the behavioral sciences (5th ed.). Stamford, CT: Cengage Learning.
    • Chapter 8: “Hypothesis Testing and Inferential Statistics”Note: To access this week’s required library resources, please click on the link to the Course Readings List, found in the Required Course Materials section of your Syllabus.
  • Article: Rice, M. E., & Harris, G. T. (2005). Comparing effect sizes in follow-up studies: ROC area, Cohen’s d, and rLaw and Human Behavior, 29(5), 615–620.

    Retrieved from the Walden Library databases.

  • Article: Intuitor. (2001). Type I and Type II errors—making mistakes in the justice system. Retrieved from http://www.intuitor.com/statistics/T1T2Errors.html