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1 year ago

7

The average amount of ozone in several cities across Pennsylvania was correlated with the average number of asthma cases in thos

e cities. What type of study is this

1 answer:

bekas [8.4K]1 year ago

3 0

Answer:

Ecological study

Step-by-step explanation:

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3 years ago

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1 year ago

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2 years ago

A statement of an employee's biweekly earnings is given below.

iogann1982 [59]

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