Table : TABLE 4-1. The Mean in Symbols The mean of a sample is an example of a statistic, whereas the mean of a population is an example of a parameter. The symbols we use depend on whether we are referring to the mean of a sample or of a population.

Number	Used for	Symbol	Pronounced
Statistic	Sample	M or	“M” or “X bar”
Parameter	Population	μ	“Mew”