![]() ![]() ![]() As the name suggests it is used when comparing the percentages of two groups. The appropriate hypothesis test for this question is the two-proportions test. Did the process improve? The Two-Proportions Test In April, the process produced 8,000 widgets and experienced a total of 72 rejects (failure = 0.009, success = 0.991). A Six Sigma project was deployed to fix this problem and by March the improvement plan was in place. Consider a production process that produced 10,000 widgets in January and experienced a total of 100 rejected widgets after a quality control inspection (i.e., failure rate = 0.01, success rate = 0.99).
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