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GCSE science. Reliability and validity watch

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    Hello,

    I have come across the words "reliability" and "validity" in GCSE science.

    I am not clear what these words mean. I have looked up definitions on various exam board web sites and specifications but the definitions seem vague and confusing to me.

    The best I can come up with is:

    Validity: this is something to do whether an experiment is "valid". But that's just a play on words.

    Reliability: guess what? that we try to ensure the measurements in an experiment are reliable. Again a completely empty "definition".

    Can anyone give me clear and concise definitions of these and/or a couple of examples of these that apply to GCSE science?

    Thanks

    Clive
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    Well for reliability, do repeats and plot a graph with your obtained results and see if they fit an expected trend. Also what if your repeat values differ alot, you cannot say that the experiment is reliable.

    As for validity, im not quite sure about that one
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    Validity is about whether you have answered the question, or found what you set out to find.
 
 
 
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