Do they require you to "show your work" or somehow demonstrate that your methodology is sound? Is there any requirement that it be repeatable (e.g. let's say t

Do they require you to "show your work" or somehow demonstrate that your methodology is sound? Is there any requirement that it be repeatable (e.g. let's say they find a minor issue in data you sourced. If you were required to provide code that does the work, rather than just the data, it could be fixed and re-run). I'm kind of fascinated by the process, but I am having a hard time figuring out how this can really work. It can't really be as simple as paying people to shove arbitrary data of unknown value in their dbs, can it?