 The term is believable... Sorry. No, it's not! The term is believability. Believability is when a researcher convinces themselves that the data itself is usable and is somewhat valid given the situation that it's been collected in. Oftentimes, believability is linked to inter-observer agreement or inter-rater reliability. An example of data that is not believable would be data that was collected by one person who was paying close attention to their phone while they were supposedly counting how many times something happened among a subject. So, although this person may be writing things down appropriately about what the subject is doing, they may not be accurate. I don't find their data believable. So we often use two observers in order to establish some inter-observer agreement. This makes the data more believable, assuming that their levels of agreement are reasonable.