Under what circumstances is it extremely difficult or even impossible for even the best design to control an extraneous variable?

Principles Of Radiographic Imaging: An Art And A Science
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ISBN:9781337711067
Author:Richard R. Carlton, Arlene M. Adler, Vesna Balac
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Chapter4: Electromagnetism
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Under what circumstances is it extremely difficult or even impossible for even the best design to control an extraneous variable?

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