Learn how to test for differences in proportions in your Six Sigma projects. In this video, Dr. Richard Chua introduces hypothesis testing for comparing proportions, including the 1 and 2 proportion tests.
- When you flip a coin, you assume you have a fair coin.…But if heads show up eight out of 10 times,…you may start wondering if the coin is fair.…So, how do you evaluate that?…Basically, you are dealing with proportions.…Similarly, in your Six Sigma projects,…you may need to test for differences in proportions.…To compare one proportion to a target value,…use the one-proportion test.…The null hypothesis is that the proportion…is equal to a target value.…
The alternate hypothesis is that the proportion…is either less than, not equal to,…or greater than the target value,…depending on the theory to be tested.…For example, let's assume that management…has set a target that defect rates should not exceed 10%.…In our example, we found that out of 120 transactions…processed, nine were defective.…This means our sample defect rate is 7.5%.…
But we are interested in the long run defect rate.…Is the long run defect rate less than 10%?…That is the particle theory to be tested.…Translating from particle to statistical,…the null hypothesis is that the population defect rate…
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