From the course: Lean Six Sigma: Analyze, Improve, and Control Tools

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Graphical and data analysis

Graphical and data analysis

From the course: Lean Six Sigma: Analyze, Improve, and Control Tools

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Graphical and data analysis

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- In Lean Six Sigma projects you may need to test the differences in variation. Let's say you want to compare variation in performance such as variability, processing times of different steps in the process. Or for example, the variation in delivery times across restaurants in the pizza chain. Let's assume that one of the axis of theories selected from the cause effect diagram to be tested is that restaurant location is a factor in impacting pizza delivery times. In other words you are to test the hypothesis that restaurant location is a factor in delivery time performance. The now hypothesis is that there is no significant difference in delivery time variances across restaurant locations. The alternate hypothesis is that there is a significant difference in delivery time variances across restaurant locations. Data was collected. And these are the dot plots of pizza delivery times sampled from four restaurants A,B,C and D. You can see amount and the pattern of variation. It looks like…

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