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The average amount of ozone in several cities across Pennsylvania was correlated with the average number of asthma cases in those cities. What type of study is this

The average amount of ozone in several cities across Pennsylvania was correlated with the average number of asthma cases in those cities. What type of study is this
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The average amount of ozone in several cities across Pennsylvania was correlated with the average number of asthma cases in those cities. What type of study is this

User Papershine
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Answer:

Ecological study

Explanation:

User Qiulang
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