Solution: A survey of 1000 students nationwide showed a mean ACT score of 21.4. A survey of 500 Ohio scores show a mean of 20.8. If the standard deviation
Question: A survey of 1000 students nationwide showed a mean ACT score of 21.4. A survey of 500 Ohio scores show a mean of 20.8. If the standard deviation in each case is 3, can we conclude that Ohio is below the national average? Use = 0.05.
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