In the population, the average IQ is 100 with a standard deviation of 15. A team of scientists wants to test a new medication to see if it has an effect on intelligence, or no effect at all. A sample of 30 participants who have taken the medication has a mean of 140. Did the. medication affect intelligence? Use a = .05. The rejection region is... less than -1.959963985 and greater than 1.959963985 less than - 2.045229642 and greater than 2.045229642 O less than - 1.644853627 and greater than 1.644853627 none of the above O O O

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