The Relationship Between Reliability & Validity

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: What is Internal Validity in Research? - Definition & Examples

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
 Replay
Your next lesson will play in 10 seconds
  • 0:05 Measurement
  • 0:56 Reliability vs. Validity
  • 3:14 Relationship
  • 5:17 Lesson Summary
Save Save Save

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Log in or Sign up

Timeline
Autoplay
Autoplay
Speed Speed

Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Natalie Boyd

Natalie is a teacher and holds an MA in English Education and is in progress on her PhD in psychology.

Though reliability and validity are different from each other, they are still related. In this lesson, we'll look at the differences of and relationship between reliability and validity.

Measurement

Imagine that you are a psychologist, and you want to study the relationship between stereotyped thinking and critical thinking. You believe that people who think in terms of stereotypes will have lower critical thinking skills than people who do not employ stereotypes in their thinking. But, how do you know whether a person thinks in terms of stereotypes or not? How do you know if they have high critical thinking skills?

Psychological measurement is the process of assessing psychological traits. These could be things like stereotyped thinking or critical thinking skills, or they could be traits, like anxiety, optimism or intelligence. When measuring anything, there are two major issues that need to be taken into account: reliability and validity. Let's look closer at both of them and how they are related to each other.

Reliability vs. Validity

You wake up one morning and step on the scale. It reads '117,' which you think is too low. You step off the scale and back on again, and it reads '143.' Okay, well, that's better, but just to be sure, you step off and back on for a third time. This time, the scale reads '108.'

I hate to break the bad news, but your scale is not reliable. Reliability is the extent to which a measurement tool gives consistent results. If your scale read '143' every time you stepped on it, it would be reliable. But, notice that the scale doesn't have to be right to be reliable; it just has to produce consistent results. For example, if your scale read '108' every single time you stepped on it, but you really weigh 143, your scale is reliable even though it's not correct.

To unlock this lesson you must be a Study.com Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back
What teachers are saying about Study.com
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account
Support