In an experiment, why would class mean data be used rather than individual data?

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  • 1 decade ago
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    It's more reliable.

    Each individual datum has a certain amount of error. It may have a lot, which would give you wrong results.

    The mean of a class of data is more accurate because the positive errors tend to cancel out the negative errors. Individual errors are "smoothed out" by averaging over the whole class.

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