Question: In statistics, why do we use the term y-bar or x-bar to represent the mean of the sample? a) y-bar represents the population mean of

In statistics, why do we use the term y-bar or x-bar to represent the mean of the sample? a) y-bar represents the population mean of the data as we do not know the mean of the sample b) y-bar includes the standard error in the sample c) we use Greek letters to represent the sample statistics in a data set d) y-bar represents the sample mean of the data as we usually do not know the mean of the population

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