Random error and sample size have an inverse relationship...As sample size INCREASES random error DECREASES.
There's a good explanation at the related link.
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The larger the sample, the lower the % error.. so to reduce a % error, increase your sample size.
how to reduce the problem of random error and systematic error while doing an experiment
Increase sample size.
... should be increased by a factor of 4. Note that this implies that the only errors are statistical (random) in nature; increasing the sample size won't improve systematic errors.
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