# Threats to Internal Validity III: Selection, Maturation & Selection Interaction

Instructions:

question 1 of 3

### What is it called when a researcher can prove that only the independent variable caused the changes in the dependent variable?

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### 2. Pearl wants to know if a drug makes people feel happy. To one group, she assigns subjects who are naturally happy people, and she assigns mostly depressed people to the other group. This is an example of:

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Internal validity is the extent to which a researcher proves that only the independent variable is responsible for changes in the dependent variable. This quiz and worksheet combination will help you understand threats to this measurement, including selection, selection interaction, and maturation. The questions on the quiz will test you on internal validity, selection, maturation, and selection interaction as concepts.

## Quiz & Worksheet Goals

In these assessments, you'll be tested on:

• The definition and purpose of internal validity
• Identifying threats to internal validity in a sample scenario
• Defining selection interaction

## 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 selection, selection interaction, and maturation as threats to internal validity
• Defining key concepts - ensure that you can accurately define main phrases, such as selection, selection interaction, and maturity as concepts
• Information recall - access the knowledge you've gained regarding threats to internal validity to identify these threats in sample scenarios
• Knowledge application - use your knowledge of selection, selection interaction, and maturation to answer questions about particular threats to internal validity