91.6k views
18 votes
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
by
7.5k points

1 Answer

0 votes

Answer:

Ecological study

Explanation:

User Qiulang
by
6.9k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.