The real value of a measurement, it is could be measured with no errors at all.
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Precise Data
1. Measurements that give similar values when repeated. The replicates will therefore have a small range.
2. Data measured on sensitive equipment with a suitably fine scale.
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Reliable Data
Findings that can be repeated.
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Accurate
Measurements that are close to the true value
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Valid Data
The best quality data. Data that is precise and reliable and obtained from an unbiased, controlled experiment. It is data which is considered to be accurate.
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Evidence
Any data or observations that are used to support a particular hypothesis.
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Anecdote
Cannot be used as evidence. However, can be useful to suggest a testable hypothesis.
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