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Errors In Six Sigma Process. The six sigma and lean manufacturing process can be very hard to understand for a lot of people. Six is nothing but an indicator, an acceptable error rate. For exemplification, the companies that operate on the Sigma level 1 perform correctly in a 30 percent proportion. The Sigma number grows as the performance ameliorates.
Since the p-value is 0.289, i.e. greater than 0.05 (or 5 percent), it can be concluded that there is no difference between the means. To say that there is a difference is taking a 28.9 percent risk of being wrong. If the two-sample t-test is being used as a tool for practical Six Sigma use, that is enough to know.