About This Chapter
Who's it for?
Anyone who needs help learning or mastering research methods in psychology material will benefit from taking this course. There is no faster or easier way to learn about psychology research methods. Among those who would benefit are:
- Students who have fallen behind in understanding external validity and the methods used to increase it
- Students who struggle with learning disabilities or learning differences, including autism and ADHD
- Students who prefer multiple ways of learning psychology (visual or auditory)
- Students who have missed class time and need to catch up
- Students who need an efficient way to learn about external validity
- Students who struggle to understand their teachers
- Students who attend schools without extra psychology learning resources
How it works:
- Find videos in our course that cover what you need to learn or review.
- Press play and watch the video lesson.
- Refer to the video transcripts to reinforce your learning.
- Test your understanding of each lesson with short quizzes.
- Verify you're ready by completing the External Validity chapter exam.
Why it works:
- Study Efficiently: Skip what you know, review what you don't.
- Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
- Be Ready on Test Day: Use the External Validity chapter exam to be prepared.
- Get Extra Support: Ask our subject-matter experts any external validity question. They're here to help!
- Study With Flexibility: Watch videos on any web-ready device.
Students will review:
This chapter helps students review the concepts in an external validity unit of a standard research methods in psychology course. Topics covered include:
- Requirements of external validity
- Sample characteristics, stimulus characteristics and experimental arrangements
- Novelty effects, test sensitization and measurement timing
- Reactivity of experimental arrangements and assessment
- Methods for increasing external validity
1. What is External Validity in Research? - Definition & Examples
The purpose of research is to say something about the real world. But how can a researcher generalize results to the world at large? In this lesson, we'll answer that question as we learn about external validity.
2. Requirements of External Validity: Internal Validity & Replication
In order to generalize results from studies to the real world, there are a couple of things that are required. In this lesson, we look at the requirements for external validity: replication and internal validity.
3. Generalization & External Validity
The point of research is to be able to generalize findings to the world at large. In this lesson, we'll look at three types of generalizing that make up external validity: across subjects, from procedures to constructs, and beyond the lab.
4. Threats to External Validity: Sample Characteristics, Stimulus Characteristics & Experimental Arrangements
The goal of research is to generalize the results, but there are several things that can get in the way. This lesson examines three threats to external validity: sample characteristics, stimulus characteristics, and multiple-treatment interference.
5. How Novelty Effects, Test Sensitization & Measurement Timing Can Threaten External Validity
The purpose of research is to find things out about the world at large. But there are several things that can get in the way of external validity. In this lesson, we'll examine novelty effects, test sensitization, and measurement timing.
6. Reactivity of Experimental Arrangements & Assessment: Threats to External Validity
The goal of research is to say something about what happens in the real world. But what happens if subjects react to the experimental conditions? In this lesson, we'll look at two reactivity threats to external validity.
7. Methods for Increasing External Validity
External validity is a key component of research. In this lesson, we'll look at several different ways to increase external validity, including aggregation, nonreactive measures, and field research.
8. Content Validity: Definition, Index & Examples
In this lesson, you will learn to define content validity and learn how it is used in the development of assessment and measurement tools. Following this lesson, you will have the opportunity to test your knowledge with a short quiz.
9. External Validity in Psychology: Threats, Definition & Examples
External validity is related to how well your study results are able to be generalized to other people, times, and situations. Learn more about external validity and the threats to external validity.
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Other chapters within the Research Methods in Psychology: Help and Review course
- Introduction to Research Methods: Help and Review
- Principles of Ethical Research: Help and Review
- Setting Up the Research Study: Help and Review
- Data Collection Techniques in Psychology: Help and Review
- Nonexperimental Research: Help and Review
- Qualitative Research Methods and Design: Help and Review
- Quasi-Experimental Research: Help and Review
- Sampling and Generalization: Help and Review
- Measurement in Research: Help and Review
- Internal Validity in Research: Help and Review
- Experimental Design: Help and Review
- Descriptive Statistics in Psychology: Help and Review
- Inferential Statistics in Psychology: Help and Review
- Evaluating Research Findings: Help and Review
- Ethics in Counselor-Supervisor Relationships