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In research, the symbol used to designate the total number in a sample is ______, and...

In research, the symbol used to designate the total number in a sample is ______, and the symbol used to designate a subtotal, or subsample, of the total sample size is _________.

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* In research ,the symbol used to designate the total number in a sample is "N".

   and the symbol used to designate a subtotal of total sample size is "n".

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