A man in a red shirt is standing next to a woman in a blue dress. They are both holding hands and smiling at each other. You will decide whether the data are sufficiently reliable for the purposes of the engagement, not sufficiently reliable, or as yet undetermined. If the data are sufficiently reliable, then the second sentence is true. If not, then the second sentence is false. If a study only involves one or a few sites, does it automatically make it a case study?
yes
it is not possible to tell
no