Z-scores represent a crucial concept within the world of Lean Six Sigma, assisting you to assess how far a observation lies from the mean of its dataset . Essentially, a z-score indicates you the number of standard deviation between a specific point and the average score. Higher z-scores suggest the value is above the mean , while negative z-scores

The Chi-square test acts as a statistical method used to examine the relationship between two or more categorical variables. That evaluates 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 indicates the sum of squared differences between the ob