Count up the number of obseravtions made on the experimental units. That is the sample size.
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by using the capture-recapture method which gives you the total size of organisms in a population.
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.
a sample is a sample sized piece given... a sample size is the amount given in one sample
I believe you want the equation to calculate the standard deviation of a sample. The equation is: s = square root[ sum from i =1 to n of (xi- xbar)/(n-1)] where xbar is the average of values of the sample and n = size of sample.
sample size is the specific size of a thing like the how long or wide. while sample unit is the whole thing not referring to specific number size.