![]() In any distribution, about 95% of values will be within 2 standard deviations of the mean. It is a measure of how far each observed value is from the mean. Standard deviation tells you how spread out the data is. What does it mean to be 2 standard deviations away from the mean? 5 Sigma: 233 errors per million (99.97% accuracy). 2 Sigma: 308K errors per million (69% accuracy). What is difference between 1 sigma and 6 Sigma?ġ Sigma: 690K errors per million (31% accuracy). In statistical control, 1 sigma is the lowest sigma and 6 sigma the highest. Which is better 2 sigma or 3 sigma?Ī 2 sigma control limit, therefore, indicates the extent to which data deviates from the 95% probability, and a 3 sigma control limit indicates the extent to which the defects deviate from the acceptable 1,350 defects. ![]() Around 0.1% of the population is 4 standard deviations from the mean, the geniuses. Higher sigma values mean that the discovery is less and less likely to be accidentally a mistake or ‘random chance’. Two-sigma includes 95 percent and three-sigma includes 99.7 percent.
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