Using 1.5 sigma as a standard deviation gives us a strong advantage in improving quality not only in industrial processes and designs but in commercial processes as well.

Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.

With standard deviation at 1.91 percent, it suggests that the range is plus or minus 1.91 percentage points from the average, meaning that Apple’s returns tend to range from -1.83 percent to 1. ...

The standard deviation = √0.2564 = 0.5064. Calculate three sigma. ... Shewhart set three standard deviation (3-sigma) limits as a rational and economic guide to minimum economic loss.

The goal of a Six Sigma quality program is a deviation of no more than one-twelfth part, or 0.83 percent, plus or minus. This represents a reduction in errors at every stage of the production process.

Six Sigma, which Motorola created in the 1980s and General Electric adopted in the 1990s, refers to the bell curve in statistics. One standard deviation from the mean, or the highest part of the ...

Standard deviation can be thought of as a comparison between expected results or outcomes in a group of operations versus those that fail. With Six Sigma Standard deviation we arrive at 3.4 defects ...