How does the standard deviation formula differ for samples and populations?
A) Xi is used to represent the score of a variable in the population; N is used to represent scores in a sample.
B) Xi is used to represent the score of a variable in the sample; N is used to represent scores in a population.
C) ì is used to represent the population mean; 
is used to represent a sample's mean.
D) Standard deviations can be calculated for samples only, not for populations.
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