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Answer the question !!! What improvements could I make if I wanted to have a better controlled experiment ? And think about some uncontrolled variables that may have affected the data ?? Please help me !!!!!

Answer the question !!! What improvements could I make if I wanted to have a better-example-1
User Drewh
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you could have made sure the books were the same weight and your friends could have done it at the same time as you
User Dusm
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