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### How to Create a Six Sigma Multi Vari Sampling Plan

Multi-vari uses a specific data sampling plan, which graphically highlights the major variation cause in the output characteristic of your Six Sigma process while allowing the process to operate in its [more…]

### How to Construct and Interpret a Normal Probability Plot for a Six Sigma Project

Seeking clarification is critical in Six Sigma and normal probability plots can help with this. When someone tells you that his or her data are normal, always respond with, “How normal are they?” No real-world [more…]

### How to Apply Six Sigma Multi Vari Study to a Real World Problem

Consider an example of a real situation where you can use a multi-vari study for a Sigma Six project. It can be used to pare down a large collection of potential factors and discover the “critical few” [more…]

### How to Use Confidence Intervals to Verify Differences between Outcomes

Confidence intervals give you a way of quantifying how much variation will appear in repeated measurements and statistical calculations for Six Sigma. Knowing how to create confidence intervals, you’ll [more…]

### Six Sigma Analysis: How to Fit Lines in Simple Linear Regression with Excel

Simple linear regression is becoming a common activity. Any Sigma Six practitioner with Microsoft Excel, for example, can take data from an *X* and a *Y* variable and almost immediately create a scatter plot [more…]

### How to Calculate Multiple Linear Regression for Six Sigma

What should Six Sigma practitioners do with all the situations where more than one *X* influences a *Y?* You use *multiple linear regression.* After all, that kind of situation is more common than a single influencing [more…]

### How to Use the Six Sigma Experimental Approach

You may be wondering whether a solid strategy for experimentation even exists. Lucky for you, we have just that. Six Sigma uses a reliable approach to experimentation that helps you do the following: [more…]

### How to Plan a Six Sigma 2^{k} Factorial Experiment

Like in most other endeavors, time spent planning for Six Sigma is rewarded with better results in a shorter period of time. Planning 2* ^{k}* factorial experiments follows a simple pattern: choosing the factors [more…]

### How to Conduct a Six Sigma 2^{k} Factorial Experiment

Carrying out a well-planned 2^{k} factorial experiment for Six Sigma is easy — it’s like falling off a log. You just have to roll up your sleeves and get into the scientific trenches. [more…]

**How to Create a Six Sigma Control Phase Plan**

Six Sigma emphasizes the Control phase and planning for it because previous attempts at improving quality and business performance repeatedly demonstrated that process behavior is complex and fragile and [more…]

### What is 5S in Six Sigma?

For Six Sigma, 5S can be invaluable for reducing waste. High-performing processes and workplaces are always characterized by organization and cleanliness. The whole point is to reduce or keep out waste [more…]

### How to Mistake Proof with Poka Yoke in Six Sigma

*Mistake-proofing,* or *Poka-Yoke* (pronounced POH-kuh YOH-kay) as it’s known in Japan, is an action you take in Six Sigma to remove or significantly lower the opportunity for an error or to make the error [more…]

### How to Implement a Control Chart for Six Sigma

The primary SPC tool for Six Sigma is the *control chart*— a graphical tracking of a process input or an output over time. In the control chart, these tracked measurements are visually compared to decision [more…]

### How to Use Control Charts to Keep Six Sigma Improvements on Track

If you apply control charting as a part of your Six Sigma process control plan, you can use the control chart itself to trigger action or to leave things as they are based on what the control chart tells [more…]

### Process Intelligence Tools to Interpret Results for Six Sigma

Process intelligence tools give you all the information you need to understand what’s happening with process behavior and performance in a Six Sigma Initiative. These tools are vitally important because [more…]

### How to Define a Six Sigma Project

When defining a project, you get into the nuts and bolts of Six Sigma. Doing this step right is well worth your time because 50 percent of your project’s success depends on how well it’s defined! [more…]

### Brainstorming Tools for a Six Sigma Initiative

At this point in your Six Sigma project, the intent of your brainstorming is to generate and capture a list of possible factors (the *X*s) that may be influencing the key output [more…]

### Six Sigma Failure Mode Effects Analysis

*Failure mode effects analysis* (FMEA) is a tool you can use in Six Sigma to quantify and prioritize risk within a process, product, or system and then track actions to mitigate that risk. It’s valuable [more…]

### Failure Modes in FMEA for a Six Sigma Initiative

FMEA can be very valuable for identifying failure modes in a Six Sigma Initiative. After scoring the severity of the possible effects, your cross-functional FMEA team brainstorms potential causes of the [more…]

### What is Statistical Distribution in Six Sigma?

*Distribution* is the statistical term that describes the relative likelihood of observing values for a variable factor. When you think of a Six Sigma initiative and the critical performance characteristics [more…]

### How to Construct and Interpret a Multi Vari Chart for a Six Sigma Initiative

You don’t have to wait until your multi-vari data are collected to start creating the multi-vari chart for Six Sigma. Instead, you can build the chart, incrementally, adding more to it as you collect more [more…]

### What is Short Term Variation in Six Sigma?

When enacting a Six Sigma initiative, you will undoubtedly encounter short term variation. Short-term variation is purely random. Like rolling a pair of dice, you can’t predict what the next output value [more…]

### What is Long Term Variation in Six Sigma?

You will need to understand long term variation to launch a successful Six Sigma initiative. When underlying disturbances are added to the natural short-term variation, the overall combination is called [more…]

### How to Create and Interpret Dot Plots and Histograms in a Six Sigma Project

Both dot plots and histograms give you lots of information about the variation of a critical characteristic in a process for a Six Sigma initiative. A [more…]

### How to Create and Interpret Box and Whisker Plots for a Six Sigma Project

Like putting two people back-to-back to see who’s taller, Sigma Six uses *box and whisker plots* (or just *box plots*) to directly compare two or more variation distributions. When you need to compare value [more…]