Threats to Internal Validity I: History, Instrumentation & Subject Mortality


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Internal validity is the extent to which a researcher can say that _____ caused changes in _____.

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1. Andre does a study with subjects measuring their focus. Part of the way through the period with the first group, they have a fire drill. The fire drill does not occur during his period with the second group. Which type of threat is this an example of?

2. Carrie is doing an experiment relating to work ethic, her independent variable is monetary reward. Though when interacting with her two groups, she ends up treating them differently. For group A, she is really nice and friendly, but for group B, she is gruff. What type of threat to internal validity is this?

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About This Quiz & Worksheet

What is the definition of internal validity? Can you recognize examples of types of threats to internal validity? Find out with this multiple-choice quiz/worksheet combo.

Quiz & Worksheet Goals

Prepare to answer questions on the following:

  • What mortality means as related to internal validity
  • Examples of threats to internal validity
  • Variables in internal validity

Skills Practiced

This worksheet and quiz will let you practice the following skills:

  • Knowledge application - use your knowledge to answer questions about internal validity
  • Interpreting information - verify that you can read information regarding what can threaten internal validity and interpret it correctly
  • Defining key concepts - ensure that you know what mortality means in this context

Additional Learning

If you wish to learn more, review the lesson called Threats to Internal Validity I: History, Instrumentation & Subject Mortality. This lesson will help you:

  • Understand the relationship between dependent and independent variables
  • Identify the major threats to internal validity
  • Describe the characteristics of each of the threats