so the margin of error is high. It says only that "five people tested HIV positive" so if, in this limited sample, they had had two fewer HIV+ persons they would have gotten a number equal to the average for the USA.
5 / 791 = .006 or .6% 3 / 791 = .0039 or .4%
Heck if they had only 2 HIV+ they could have written an article explaining how mexican migrants have a lower rate of HIV than Americans. Of course they wouldn't write THAT article.
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