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Validity, reliability and accuracy

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When you carry out an investigation you want to be able to trust your results. To do this there are three terms you should know.

A valid experiment tests the hypothesis, has all variables controlled except the one that has been changed, and has errors reduced by having more than one copy of the experiment.

A reliable experiment produces the same result when you repeat it.

An accurate experiment has measurements taken very carefully and no mistakes are made when carrying out the test.

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