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Mathematics 8 Online
OpenStudy (anonymous):

If you are studying the effects of UV rays on eyesight and you group 10 people together and make them wear sunglasses for 10 weeks and see if their eyesight is affected and then take another group and do not give them sunglasses and test their vision after 10 weeks, what is the treatment ? (note this is not an ethical study) Question 20 options: eyesight vision test sunglasses 10 weeks

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