Z-scores are a important concept within the Lean Six Sigma methodology , assisting you to evaluate how far a observation lies from the mean of its population. Essentially, a z-score tells you the quantity of standard deviation between a specific result and the average score. Large z-scores suggest the observation is above the average , while smalle

The Chi-square test is a statistical method used to analyze the relationship between two or more categorical variables. This measures whether there is a substantial difference between the observed and expected frequencies in a dataset. The test depends on the concept of chi-square, which represents the sum of squared differences between the observe