In this video, learn to determine sample sizes for estimating means and proportions when conducting a Six Sigma project.
- In the measure phase of a Six Sigma project,…the project team needs to collect data…to measure the baseline performance of Y.…Since it's not always possible to measure every item…in the population, samples are collected.…So you might be wondering, "How do you sample?"…And, "How much do you sample?"…How to sample is called sampling strategy,…which I cover in other Six Sigma courses.…How much to sample brings us to the question:…what should be the sample size?…The sample size determination depends…on whether the type of data to be collected…is continuous or discrete.…
If the type of data is continuous,…you probably need to sample from the process…to estimate the mean, such as the mean processing time…of invoices.…Here is a sample size to estimate the mean…with 95% confidence.…Where Z is from the normal distribution,…and 1.96 is the Z value for a 95% confidence level.…And S is a standard deviation, and D is the precision.…So how precise do you want the estimate to be?…If you want the estimate to be accurate…within plus, minus five minutes,…
Author
Released
5/25/2017Dr. Richard Chua builds upon his Six Sigma: Green Belt, Six Sigma Foundations, and Learning Minitab courses—which are prerequisites to this course—and covers an array of topics, including measurement system analysis, hypothesis testing, response surface methods, displaying improved process capabilities, and more.
- Process flow metrics
- Measurement system analysis
- Calculating process capability
- Hypothesis testing
- Confidence intervals
- Testing for normality
- Designing, conducting, and analyzing full-factorial experiments
- Using fractional factorial experiments for screening
- Displaying improved process capability
Skill Level Intermediate
Duration
Views
Related Courses
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Learning Minitab
with Richard Chua1h 16m Intermediate -
Statistics Foundations: 2
with Eddie Davila1h 56m Intermediate -
Six Sigma: Green Belt
with Richard Chua1h 53m Intermediate -
Lean Six Sigma: Define and Measure Tools
with Richard Chua1h 25m Intermediate
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Introduction
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Welcome1m 38s
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Certification information1m 31s
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Exercise files34s
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1. Define Phase
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Overview of the Define phase3m 51s
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2. Measure Phase
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Process flow metrics3m 34s
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Sample sizes3m 7s
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3. Analyze Phase
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Hypothesis testing road map3m 33s
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Confidence intervals3m 14s
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Test for normality2m 49s
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Compare variances5m 16s
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T-tests6m 4s
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ANOVA3m 55s
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Contingency tables6m 49s
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Nonparametric tests6m 49s
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Correlation3m 45s
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Linear regression4m 38s
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Multiple regression5m 5s
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4. Improve Phase
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Full-factorial experiments9m 19s
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DOE with curvature6m 27s
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Response surface methods8m 37s
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5. Control Phase
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SPC chart selection4m 46s
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SPC chart analysis5m 1s
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Conclusion
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Next steps56s
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Video: Sample sizes