Create X-bar and R control charts in excel tutorial

In statistical quality control, the \bar x and R chart is a type of control chart used to monitor variables data when samples are collected at regular intervals from a business or industrial process

The chart is advantageous in the following situations

The sample size is relatively small (say, n ≤ 10—\bar x and s charts are typically used for larger sample sizes)
The sample size is constant
Humans must perform the calculations for the chart