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- Identify which concepts are covered on your internal validity in research homework.
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Topics from your homework you'll be able to complete:
- Extraneous and confounding variables
- Physical variables that affect internal validity
- Researcher variables
- Participant variables
- Threats to internal validity
- Controls for extraneous variables
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.
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.
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.
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.
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.
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.
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.
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.
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.
10. Confounds in Psychology: Definition & Concept
In this lesson, you will discover how several different factors, known as confounds, can influence the results of an experiment. You will also learn how researchers work to prevent confounds from ruining the validity of their study.
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Other chapters within the Research Methods in Psychology: Homework Help Resource course
- Introduction to Research Methods: Homework Help
- Principles of Ethical Research: Homework Help
- Setting Up the Research Study: Homework Help
- Data Collection Techniques in Psychology: Homework Help
- Nonexperimental Research: Homework Help
- Qualitative Research Methods and Design: Homework Help
- Quasi-Experimental Research: Homework Help
- Sampling and Generalization: Homework Help
- Measurement in Research: Homework Help
- External Validity: Homework Help
- Experimental Design: Homework Help
- Descriptive Statistics in Psychology: Homework Help
- Inferential Statistics in Psychology: Homework Help
- Evaluating Research Findings: Homework Help