You are conducting a study on the health of people who have been exposed to radiation and those who have not been exposed to radiation. which of these methods of obtaining data should you most likely adopt and why?

The method of obtaining data that should be used in the current situation is : an experimental study because it involved the pre-existing condition of the subject.
With this, you can compared the data of the pre-existing and existing condition to make a conclusion

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The answer of the above is