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.

How Can the Validity of a Test Be Increased?

How Can the Validity of a Test Be Increased?

Increasing the reliability of a test is fairly straightforward—reduce the trait or method error or increase the number of items on the assessment tool. Increasing the validity of a test is not quite as straightforward but, interestingly enough, relates closely to changing the reliability of an assessment tool.

To increase the validity of a test, you can consider the following strategies.

First, while increasing reliability will not necessarily increase validity, reliability is an important precondition for validity, so make sure that the test is reliable. A low reliability coefficient constrains what the highest validity coefficient can be, so the higher the reliability, the more room for validity to increase.

Second, confirm that what you are testing is what ...

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