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Confidence Interval

In statistics, a confidence interval (CI) is a type of estimate computed from the statistics of the observed data. It is a range describing where the true population parameter lies with a certain degree of confidence. For example, a 95%...

Coefficient of Determination

In statistics, the coefficient of determination, denoted R2 or r2 and pronounced “R squared”, is the proportion of the variance in the dependent variable that is predictable from the independent variable(s). It is...

Chi-Square Test

A chi-squared test, also written as χ2 test, is a statistical hypothesis test that is valid to perform when the test statistic is chi-squared distributed under the null hypothesis, specifically Pearson’s chi-squared test and variants thereof. Pearson’s...

Chi Square Distribution

In probability theory and statistics, the chi-square distribution (also chi-squared or χ2-distribution) with k degrees of freedom is the distribution of a sum of the squares...

Champions in Six Sigma

A Champion in Six Sigma represents the highest level of executive leadership commitment to organizational transformation through data-driven process improvement. These senior leaders provide strategic direction, remove barriers, and ensure that Six Sigma initiatives...
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