Normal Distribution (AKA Gaussian Probability Distribution)
The Normal distribution is used to analyze data when there is an equally likely chance of being above or below…
How Do You Know if a Process Is Following a Normal Distribution?
Many of the analysis required in the Green Belt and Black Belt Body of knowledge assumes a normal distribution. There’s…
Process Control for Non-Normal Data
Process control for non-normal data involves monitoring and managing industrial or operational processes that produce non-normally distributed data. Non-normal data,…
F-Distribution, F-Statistic, F-Test
What is the F-Distribution? The F-distribution, also known Fisher-Snedecor distribution, is extensively used to test for equality of variances from…
Normal Probability Plot
The normal probability plot is a graphical technique for normality testing: assessing whether or not a data set is approximately normally distributed. In other…
Bimodal Distribution
A bimodal distribution has two modes. In other words, the outcome of two processes with different distributions are shown together…
Chi Square Distribution & Hypothesis Test
The Chi-Square (χ2) distribution is the best method to test a population variance against a known or assumed value of…
Binomial Distribution
What is Binomial Distribution? A Binomial Distribution describes the probability of an event with only two possible outcomes. For example,…
Data Distributions
Data distribution is a function that specifies all possible values for a variable and also quantifies the relative frequency (probability…
Analyze Phase (DMAIC)
Analyze phase is the third phase of DMAIC. The main activity in the Analyze phase is to identify the potential…
