An investigator reviewed the medical records of 200 children seen for care at Boston Medical Center in the past year who were between the ages 8-12 and identified 40 with asthma. He also identified 40 children of the same ages who were free of asthma. Each child and their family were interviewed to assess whether there might be an association between certain environmental factors such as exposure to second hand smoke. This study is an example of a:

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.