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So it is my understanding that humans cannot truly multitask. This seems true when I try to listen to two conversations at once, but doesn't when I see MMA fighters going at it. What gives?

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So it is my understanding that humans cannot truly multitask. This seems true when I try to listen to two conversations at once, but doesn't when I see MMA fighters going at it. What gives?	1
During hypothesis testing when we reject the null hypothesis, why do we "accept the alternative hypothesis" instead of "fail to reject the alternative hypothesis"?	1