Learn how to interpret hypotheses test for independence. In this video, Dr. Richard Chua demonstrates how to use the Chi-Square test for association.
- Let's talk about testing for independence.…And by way of example,…we'll use everybody's favorite topic, hospitals.…Let's say your grandmother needs to undergo surgery.…And there are four hospitals in the local area.…Should it matter which hospital she chooses?…Is the outcome independent of or dependent on…the choice of hospital?…To test this, the appropriate hypothesis test is…the chi-square test for association,…also called the test for independence.…
The null hypothesis is outcome Y is independent of factor X.…And the alternate is outcome Y is not independent,…in other words, it is dependent on factor X.…In our example, there are four hospitals…that perform the same surgery.…The possible outcomes are full recovery,…partial recovery, and death.…The table shows the number of surgeries performed…at each hospital and their outcomes for the past 12 months.…
The practical theory or question is…does the choice of hospital affect surgical outcome?…Translating from practical to statistical,…the null hypothesis is surgical outcome…
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