Calculates the STDEV () of the data-set. The STDEV is an indication of the variation of the data. A small STDEV means a small variation and the data points are close to the Mean.
STDEV or includes all the variation in the process, for short therm variation see STDEV within
The bigger the STDEV the bigger the variation in the data-set.
95% confidence interval for STDEV
To get the Confidence interval click on the graph of the data-set and it will be visible in the graph pop-up.