out of 20 computer scientists in a city all qualified to attend business conference but only 5 of them are required to attend due to logistics problem.
Used systematic sampling to select the 5 scientists to attend the conference?
Are you asking whether I used systematic sampling? No.
Should you? I dunno. If so, then just do it. I suggest you use a skip size which is not a divisor of 20.
Is there a question in there somewhere?