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Ch 10: Internal Validity in Research: Help and Review

About This Chapter

The Internal Validity chapter of this Research Methods in Psychology Help and Review course is the simplest way to master internal validity. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of internal validity in research.

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 threats to internal validity and the methods used to mitigate their effects
  • 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 internal validity in research
  • 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 Internal Validity in Research 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 Internal Validity in Research chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any internal 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 internal validity unit of a standard research methods in psychology course. Topics covered include:

  • Extraneous and confounding variables
  • Physical variables that affect internal validity
  • Researcher and participant variables that affect internal validity
  • Instrumentation and subject mortality
  • Statistical regression and testing effects
  • Subject selection and maturation
  • Single blind, double blind and placebo control methods

9 Lessons in Chapter 10: Internal Validity in Research: Help and Review
Test your knowledge with a 30-question chapter practice test
What is Internal Validity in Research? - Definition & Examples

1. What is Internal Validity in Research? - Definition & Examples

The purpose of most research is to show that one variable causes changes in another variable. But, what happens when other variables come into play? In this lesson, we'll explore the definition, importance and threats to internal validity.

Extraneous & Confounding Variables: Differences & Examples

2. Extraneous & Confounding Variables: Differences & Examples

What happens when something other than your independent variable is influencing the outcome of your study? In this lesson, we'll look at two types of variables that can affect an experiment: extraneous and confounding variables.

Physical Variables that Affect Internal Validity

3. Physical Variables that Affect Internal Validity

How might a researcher accidentally mess up the results of his or her study? In this lesson, we'll look at one type of extraneous variable that can change experimental results - physical or situational variables.

Researcher Variables that Affect Internal Validity

4. Researcher Variables that Affect Internal Validity

Scientists want only the independent variable to affect the outcome of their studies, but sometimes it is the things they do themselves that change the outcome. We'll look at three common researcher-related variables: researcher bias, selection bias, and researcher personality in this lesson.

Participant Variables that Affect Internal Validity

5. Participant Variables that Affect Internal Validity

Sometimes, participants in an experiment can change the outcome. In this lesson, we'll look at some of the extraneous variables caused by participants: self-selection bias, demand characteristics, and good-subject bias.

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

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

In research, there are many things besides the independent variable that can affect the dependent variable. In this lesson, we'll look at three of those things - history, mortality, and instrumentation - and what they mean to research.

Threats to Internal Validity II: Statistical Regression & Testing

7. Threats to Internal Validity II: Statistical Regression & Testing

If you're doing research, how do you know if one thing causes another? In this lesson, we'll look at some common threats to the internal validity of experiments, including testing effects and regression to the mean.

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

8. Threats to Internal Validity III: Selection, Maturation & Selection Interaction

A major goal of research is to prove that one thing causes another thing. But there are some hurdles to being able to say that. In this lesson, we'll look at three threats to internal validity: selection, maturation, and selection interaction.

Controlling for Extraneous Variables: Single Blind, Double Blind & Placebo Methods

9. Controlling for Extraneous Variables: Single Blind, Double Blind & Placebo Methods

Sometimes researchers are confronted with extraneous factors that affect the outcome of their studies. In this lesson, we'll look at ways to control for these extraneous variables, including single-blind and double-blind studies and placebos.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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