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Even with no mistakes in a carefully conducted experiment, error is expected. That word error does not mean a mistake, it means that measurements can never find exactly the quantity being measured.

Suppose you measure the length of a table top, you might find it's 48.8 inches. Does that mean 48.800000 inches? no it does not, because you can't measure to an accuracy of one millionth of an inch without special equipment. Your experimental error is the difference between your measurement and the exact length of the table.

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Q: How is experimental error different from mistake?
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