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In that case I think Success One is incorrect. Repeating an experiment determines whether you get the same results again and again and again, hence reliability. Furthermore, in the exam there were two options: accuracy and validity, and they are virtually the same thing...so it couldn't have been either of them.punki_pixi said:About the accuracy vs reliability thing, in the Success One Chemistry book one of the questions said how would you improve the accuracy of the experiment and the answer was to use repetition. These people write papers and mark them so why would they say that if the answer to the multiple choice question in our exam wasn't accuracy?