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OLga [1]
2 years 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
Mathematics
1 answer:
bekas [8.4K]2 years ago
3 0

Answer:

Ecological study

Step-by-step explanation:

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3 years ago
I forgot how to do this​
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Answer:

\boxed{ \bold{  \huge{ \boxed{ \sf{1}}}}}

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\sf{ \frac{1}{2}  \times 2}

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\dashrightarrow{ \sf{ \frac{1 \times 2}{2 \times 1} }}

\dashrightarrow{ \sf{ \frac{2}{2} }}

\dashrightarrow{ \sf{1}}

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