In an increasingly data-driven world, it is more important than ever for students as well as professionals to better understand basic statistical concepts. 100 Questions (and Answers) About Statistics addresses the essential questions that students ask about statistics in a concise and accessible way. It is perfect for instructors, students, and practitioners as a supplement to more comprehensive materials, or as a desk reference with quick answers to the most frequently asked questions.

What Is Validity, and What Is an Example of How It Can Be Established?

What Is Validity, and What Is an Example of How It Can Be Established?

Validity, after reliability, is the second most critical psychometric property of any test, scale, or instrument that assesses behavior. It is the property of an assessment tool that indicates that the tool does what it says it does. And if the test or assessment tool does have validity, then outcomes associated with it have meaning. Without validity, it is impossible to attach meaning to the outcome score, and the results are in many ways useless. And of course, if the instrument that is used does not have validity, then the value of the experiment of which it is a part is called into question as well.

Basically, when one tries to ...

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