It's a hard question to answer, because validations vary dramatically from industry to industry and
country to country.
For example, validation per ISO requirements may require an quality audit by certified auditers.
This can be quite expensive. Best idea is to find the industry requirements and go from there.
Having said that, if you can find the method in a reference (for example, ASTM, USP, or other
similar reference) , you can probably find statistical data, too. Even if the statistical data isn't there,
that the method is published can simplify validation requirements.
Hope this helps and good luck.