# Threats to Internal Validity II: Statistical Regression & Testing

Instructions:

question 1 of 3

### In internal validity, a researcher wants to say that only the _____ caused the change in the _____.

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### 2. Which of the following is one way to reduce the impact of testing effects on a study?

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This quiz/worksheet combination will help you test your understanding of the two most common threats to internal validity: testing effects and regression to the mean. The questions on the quiz will test you on the definition of internal validity, your understanding of testing effects, and your knowledge on regression.

## Quiz & Worksheet Goals

This quiz and worksheet were designed to test you on:

• Your understanding of the concept of internal validity
• The definition of testing effects
• How researchers control for testing effects
• Your understanding of the concept of regression
• What is likely to happen when someone performs unusually well on a task the first time around and attempts to complete this task once more

## Skills Practiced

This quiz and worksheet will allow you to test your skills in the following areas:

• Reading comprehension - ensure that you draw and retain the most important information on internal validity, regression, and testing effects from the related lesson
• Critical thinking - apply relevant concepts to examine research in a different light
• Defining key concepts - ensure that you can accurately define internal validity and testing effects
• Information recall - access the knowledge you've gained regarding internal validity and testing effects

For more info on internal validity, statistical regression, and testing effects, review the accompanying lesson called Threats to Internal Validity II: Statistical Regression & Testing. These are additional objectives covered in the lesson:

• Define internal validity
• Define and discuss testing effects
• Understand how to control for testing effects on internal validity
• Define and discuss statistical regression
• Understand how to control for statistical regression to preserve internal validity
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