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To test if there is a difference in IQ scores between UT students and A&M students, a researcher collected IQ scores of 30 UT students and 20 A&M students

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To test if there is a difference in IQ scores between UT students

and A&M students, a researcher collected IQ scores of 30 UT students and 20 A&M students. If the population standard deviation of IQ scores across two schools are assumed to be 15, what would be the population standard error of the difference?