San:
Are you asking for 1.5% randomly selected from the entire data set? Or do you want 1.5% of the subset that meets a given condition (you said "subset a random sample with a condition"). If it's the latter, then your question hasn't been answered yet.
We should also ask whether the subset is selected with or without replacement. For small subsets of a large data set it probably does not matter a lot, but....
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