Which of the following sentences is correct? "The group of variables who are going to show the outcome of the experiment." or "The group of variables who is going to show the outcome of the experiment."
The subject is "group," so it should be "is" (not "are"). However, unless the "variables" are humans, we wouldn't use "who." (If they're not humans, we'd use "that.")
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Lisbeth Sitorus