Learn how to test Six Sigma projects for differences in variation. In this video, Dr. Richard Chua demonstrates how to interpret hypotheses tests for comparing variances.
- In your Six Sigma projects,…you may need to test for differences in Variation.…Let's say, you want to compare variation in performance,…such as variability of processing times…of different steps in the process.…Or, for example, the variation in delivery times…across restaurants in your pizza chain.…So, you want to see how consistent the output is…compared to a target, standard deviation, or variance value.…These are the Dotplots of pizza delivery times…sampled from four restaurants: A, B, C, and D.…
You can see the amount and the pattern of variation.…Looks like A is the most consistent.…And here are the Boxplots.…The vertical axis is delivery time, in minutes.…The longer the Boxplots, the larger the variation.…It looks like restaurant C has the largest variation.…C is the most inconsistent.…On the other hand, restaurant A has the least variation;…very consistent.…
Now, if you are interested in running the analysis…of the data used in these examples,…you can follow along in my course Introduction to Minitab.…
Dr. Richard Chua builds upon his Six Sigma Foundations and Learning Minitab courses, and covers an array of topics, including measurement system analysis, descriptive statistics, hypothesis testing, design of experiments, statistical process control, and more.
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- Six Sigma and the organization
- Collecting the voice of the customer
- Project management basics
- Process maps
- Sampling in data collection
- Measurement system analysis
- Measuring performance using descriptive statistics
- Process performance measures
- Hypothesis testing
- Testing for means, variances, proportions, and independence
- Correlation and regression
- Using selection matrices
- Using failure modes and effects analysis
- Developing control plans
- Statistical process control