# p-Value

In the branch of statistics dealing with test reliability, and unlike other branches of statistics, **p-Value** is a simple measure of question difficulty. The p-Value ranges from a low of **0.0** to a high of **+1.0**.

The closer the p-Value is to 0.0 the more difficult the question. For example, a p-Value of 0.0 means that no student answered the question correctly and therefore it's a really hard question. If an item's p-Value is unexpectedly close to 0.0, be sure to check the answer key.

The closer the p-Value is to +1.0 the easier the question. For example, a p-Value of +1.0 means that every student answered the question correctly and therefore it's a really easy question.

EAC suggestion: On high stakes exams, shoot for p-Values between +0.50 and +0.85 for most test questions. A p-Value less than +0.50 means the question may be too difficult or you should double-check the answer key. A p-Value greater than +0.85 means the question may be too easy or most students have mastered that concept.

See other test statistics: