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Scientists need be able to collect reliable results that are repeatable. This means that if they are repeated, they should get results that are close to one another. This also allows anomalies/outliers to be found.

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9y ago
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12y ago

To provide certainty, and to correct any possible errors or misguided evaluations in the first ones.

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12y ago

to make sure its true

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Q: Why do you need to repeat an investigation several times?
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