## Mood’s Median Test with SigmaXL

What is Mood’s Median Test? Mood’s median test is a statistical test to compare the medians of two or more populations. Null Hypothesis (H0): η1 = … = ηk Alternative Hypothesis (Ha): At least one of the medians is different from the others The symbol k is the number of groups of our interest and …

## Paired T Test

Hypothesis testing allows us to validate an assumption or a “hypothesized” conclusion. We are able to accomplish this by using data and statistical measures that give us a better understanding of the risks we are taking if we reject or fail to reject the null hypothesis. Using a Paired t Test is necessary when the …

## What is the Difference Between Lean Six Sigma and Six Sigma?

Many people ask, “What is the difference between Lean Six Sigma and Six Sigma?”  It should be known that the two methodologies are simply an integration of one into another. Lean Six Sigma is Six Sigma with elements of Lean integrated into its curriculum. Because the two methodologies go hand in hand, they are perfect …

## Six Sigma Approach

The Six Sigma approach to problem solving uses a transfer function. A transfer function is a mathematical expression of the relationship between the inputs and outputs of a system. Y=f(x) is the relational transfer function that is used by all Six Sigma practitioners. It is absolutely necessary to understand and embrace this concept if you wish to …

## History of Six Sigma

The history of Six Sigma finds its roots and terminology being first used by Bill Smith at Motorola in the late 1980s, as a quality management methodology. As the “Father of Six Sigma”, Bill forged the path for Six Sigma through Motorola’s CEO Bob Galvin who strongly supported Bill’s passion and efforts. Starting from the …

## What is Six Sigma?

Sigma is the measure and Six is the goal. What is Six Sigma?  Let’s start with just the “Sigma” part first. In statistics, “sigma” refers to standard deviation which is a measure of variation. Throughout the six sigma certification course you will come to learn that process variation is the enemy and reducing it is key to any quality process. You will …