Question

Reliability vs. Validity -How would you explain the difference between reliability and validity? Which examples would you use to illustrate the concept?

NCSU: Fan Aptitude Test- Suppose this clip demonstrated a serious aptitude test. What would the results of a fan aptitude test reveal to us? Is this a valid test of intelligence? Why or why not?

NFL and the Wonderlic Test- Why do employers give job candidates tests like the Wonderlic? How do results on the Wonderlic apply to a bodily-kinesthetic career in the National Football League? What happened to Pat McAnally, the player who earned the only perfect Wonderlic score in NFL history? What does this say about aptitude tests like Wonderlic?

links to video; https://youtu.be/1brINlIxvKU ,  https://youtu.be/KM5PIC0n8yU,  https://youtu.be/JJCPc1BKl5A

Answer 1

Reliability and validity are two important key concepts to measure the biases of any test.
Reliability refers to the consistency of any research and test. Any person who conducts the test at any point over different condition on the same participant would deliver same results. Here Stability and consistency play a critical role. Validity means does test measures what it supposes to measure. Here credibility plays an important role.

Both have a very important or related to each other. If the test is valid, it has to be reliable. The test is not likely to predict anything if participant receiving a different score on the same test in different situation or time. However, if a test is reliable, that does not mean that it is valid. For example, we can measure the strength of grip very reliably, but that does not make it a valid measure of intelligence or even of mechanical ability. Reliability is necessary, but not a condition for validity.

- For the NCSU: Fan Aptitude Test & NFL and the Wonderlic Test, please share more details. let's not work on video and get judgemental on validity aspect. Need more understanding.