Help Green Belts use statistical analysis by emphasizing not only when and why a tool or methodology is used but also what the data says in "plain English." Memorizing complex formulas is not necessary, but basic formulas, should be shared.
Most surveys draw their conclusions from a sampling a larger group. How well the sample represents the larger population is gauged by two important statistics which quality professionals should understand the margin of error and confidence level.
In sampling, a comparatively small number of customers, called a sample, is used to draw conclusions about a population. Although this method saves time and money, it comes with a higher margin of error that must be taken into consideration.