A bi-modal distribution has two modes. In other words, outcome of two processes with different distributions are combined in one set of data.
Specification limits are set by the customers; often, Voice of the Customer is referred to as the customer specification limits.
Z scores are the number of standard deviations a score or a value (x) away from the mean and are a measure of the dispersion of data.
A Chi-Square goodness of fit test tells how well a categorical (nominal or ordinal) sample distribution fit into a hypothetical distribution.
Learn how to analyze your Six Sigma projects using financial measures. This will give you insight into the wider effects of your efforts.