We know that Aneroxia nervosa is a disorder which is characterized by low body weight. Aneroxia nervosa is a result of self starvation or low energy intake by individuals.
Suppose a researcher want to study the Aneroxia nervosa data by collecting the data from 10 people.
It is clear that there is no specific control or treatment given by the researcher for study of Aneroxia nervosa, but the researcher will only be able to record the data which is already present or researcher will only be able to observe the data.
We know that observational study are those studies where the researcher just observe the data without influencing the data.
In this case, we can see that the researcher is just observing or collecting the data from 10 people who have Aneroxia nervosa without having any influence on the data.
So, this is clearly a case of observational study.
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