> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/feature-management-experimentation/use-fme/experimentation/key-concepts/p-value.md).

# P-value

The **p-value** is the probability of observing a result at least as extreme as the one seen in your experiment, assuming the **null hypothesis** is true (i.e., that your treatment had no effect).

In practice, p-values are used to determine **statistical significance**. If your p-value is lower than your chosen significance threshold (commonly 0.05), the result is considered statistically significant.

For more information about p-values, see [Statistical significance](/feature-management-experimentation/use-fme/experimentation/key-concepts/statistical-significance.md).