As a researcher for the EPA, you have been asked to determine if the air quality in the United States have changed over the past 2 years. You select a random sample of 10 metropolitan areas and find the number of days each year that the areas failed to meet acceptable air quality Based on the data, answer the following questions. 7. What is your conclusion? 8. Could an independent means test have been used? 9. Do you think this was a good way to answer the original question?

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Q: Select the statement below that gives an example of a statistic.

A: Select the statement below that gives an example of a statistic. 1): According to census data, about…

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Q: In a survey of 400 items in a production line, it was discovered that 10% are defective. What is the…

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Q: Explain the Representative Sample from a Population in Which the Variables Are Related?

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Q: Which of these conclusions and justifications is the MOST reasonable?

A: Solution:

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