Answer to Question #3677 in Statistics and Probability for tami

Question #3677
A researcher looks at old medical records for cancer patients to compare treatments and recovery rates. Is this an experiment or observational study? Explain.
1
Expert's answer
2011-07-20T11:55:06-0400

It is an experiment as resercher compare the data and get new information(he
creates it).
But when only looking throught records is observation.

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