## x bar

### In statistics, “x bar” refers to the sample mean

In statistics, “x bar” refers to the sample mean. It is represented by the symbol “x” with a bar on top, which indicates that it is an estimated value of the population mean based on a sample.

The sample mean, x bar, is calculated by summing up all the individual data values in the sample and then dividing the sum by the number of data points. Mathematically, it can be expressed as:

x bar = (x1 + x2 + x3 + … + xn) / n

Where x1, x2, x3, …, xn are the individual data points in the sample, and n is the number of data points.

The sample mean is a measure of central tendency that gives an indication of the average value of the data. It is commonly used to summarize numerical data and is particularly useful when dealing with large datasets.

It is important to note that the sample mean, x bar, is an estimate of the true population mean, μ. The accuracy of this estimate depends on the representativeness of the sample and the size of the sample. With larger samples, the sample mean tends to provide a more accurate estimate of the population mean.

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