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Increase n or sample size.
A large sample reduces the variability of the estimate. The extent to which variability is reduced depends on the quality of the sample, what variable is being estimated and the underlying distribution for that variable.
Correlational or Experimental or maybe Grounded Theory and possibly even Phenomenology.
Factors that determine sample size
When something is a sample size, that means it is smaller than the size that is normally available for purchase. Sample size products are usually enough to let you try something before you buy it.