7.6 Experiments versus Observational Studies oes 29. Could the magnetic fields f

Question

7.6 Experiments versus Observational Studies oes 29. Could the magnetic fields from power lines cause leukemia in children? Investigators who wanted to explore this question spent five years and $5 million comparing 638 children who had leukemia and 620 who of and did not. They went into the homes and actually measurec the magnetic fields in the children's bedrooms, in other rooms, and at the front door. They recorded facts about nearby power lines for the family home, as well as for the mother's residence when she was pregnant. Result: They 23

Explanation / Answer

It is not an experiment because in an experiment we apply treatments to a group and record the effects and variables are in control of the experimentator. But here variables are not in control.

Whereas, An observational study is a study where researchers simply collect data based on what is seen and heard and infer based on the data collected. Researchers do not interfere with the subjects or variables in any way.

Here, we are just studying the effects of the magnetic field from power lines on students and not applying any treatment.

Therefore it is an Observational Study.

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