The best replacement for sample size is population size.

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★★★★	confidence level
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★	number of samples
★	effect size
★	margin of error
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Speaking about sample size, one probably shouldn't forget about margin of error.

Other search terms related to sample size and their ratings are:

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★★★★	standard deviation
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★★★	mean and standard deviation
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★★★	confidence level
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sample size

population size

confidence level