There is no "ideal" sample size for any given population, because polls and other statistical analysis forms depend on many factors, including what the survey is intended to show, who the target audience is, how much statistical error is permitted, and so on. The "Survey System" link, below, offers definitions and a couple of calculators to determine the best sample size for most purposes.
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a sample is a sample sized piece given... a sample size is the amount given in one sample
yes
It is the number of elements in the sample. By contrast, the relative sample size is the absolute sample size divided by the population size.
he was the one who introduced the slovin's formula, the estimated sample size given the population size and margin of error
You can estimate a population's size when counting individuals if the density in a sample is greater than the population density.