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1 Proportion Test 1 Proportion Test is generally known as one-sample z test for proportions. This is a statistical method which commonly used to determine that the proportion in certain characteristics in our used sample is significantly different or not from our hypothesized proportion. This test is generally helpful in single group. As we know that this is a statistical tool so we generally use this tool in Measure and Analyze phase in DMAIC methodology. Measure - In Measure phase, we collect the related data to understand the current situation of our problem. Also, we try to understand the problem with data which we are trying to investigate. So, we use this 1 Proportion Test in measure phase to determine that we are assessing that whether a proportion which we are measuring is significantly different or not? Like – defect rate etc. Analyze – In this phase, we generally analyze our problem with the help of our data to identify what are the root causes for the said problem. Also, we want to identify the relationship between cause and problem. So, it generally helps researchers to identify if a certain proportion is deviating and if this statistically significant or not? For example, if we are working on improving customer satisfaction level and we believe that the actual proportion of satisfied customer is not meeting our target. So, we can apply this test to know whether proportion of satisfied customer is significantly different from our said target or not? This test is generally more helpful when we have data, and we want to do decision making on the basis of said data.