The x-bar is the symbol (or expression) used to represent the sample mean, a statistic, and that mean is used to estimate the true population parameter, mu. To find the average height of professional basketball players (the population), we don’t need to measure every player, just some of them (the sample).

What is X bar in statistics example?

The sample mean symbol is x̄, pronounced “x bar”. The sample mean is an average value found in a sample. A sample is just a small part of a whole.

What does an X with a bar over it mean?

What Is the X-Bar Symbol? The x-bar symbol, x̄, is used in statistics to represent the mean of a set of data. This is the arithmetic mean, which is what most people think of when they say “average” – the sum of all the measurements divided by the total number of measurements.

What is X Bar vs X in statistics?

X (capital X) = a variable. x (lower-case x) = one data value (“raw score”). As a column heading, x means a series of data values. x̅ “x-bar” = mean of a sample.