Discuss about the observational study

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Indicate whether the study is an observational study or a controlled experiment.

A researcher was interested in the effect of chamomile tea on sleep. He compared a group of middle-aged women who drink chamomile tea each night to those who do not. He observed their moods in the morning to determine whether or not chamomile tea was effective in improving the quality of their sleep.

Reference no: EM131786346

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