From the course: Six Sigma: Green Belt
Join today to access over 22,600 courses taught by industry experts or purchase this course individually.
Tests for variances
- In your Six Sigma projects you may need to test for differences in variation. Let's say you want to compare variation and performance, such as variability of processing times of different steps in a 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 sample 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're interested in running the analysis of the data used…
Practice while you learn with exercise files
Download the files the instructor uses to teach the course. Follow along and learn by watching, listening and practicing.
Download courses and learn on the go
Watch courses on your mobile device without an internet connection. Download courses using your iOS or Android LinkedIn Learning app.