Dr. Carey gives a variety of achievement and aptitude tests to 1,000 ten-year-old children from Southside Elementary School and 1,000 ten-year-old children from Northside Elementary School. He finds that, on average, the Southside students perform better on the tests than the Northside students. He concludes that the teachers at Southside are superior to those at Northside. Is this conclusion
warranted? Why or why not?
What will be an ideal response?
Dr. Carey's conclusion is not warranted because he has failed to control for other possible explanations for the differences in test scores (class size, curriculum, educational backgrounds of the parents, etc.).
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