<prompt> Translate the following text to SwahiliCase studies often use one or only a few instances, because collecting and analyzing comprehensive data are prohibitively difficult for large numbers of sites.  <response>: Uchunguzi wa kesi mara nyingi hutumia mfano mmoja au wachache tu, kwa sababu kukusanya na kuchambua data kamili ni ngumu sana kwa idadi kubwa ya tovuti. 