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Hypothesis testing is an essential procedure in statistics , it evaluates two mutually exclusive statements about a population to determine which statement is best supported by data i.e which statement is statistically significant. But, why do we need hypothesis testing ? that is because we are making our conclusion about a population basis the sample data – hypothesis tests helps assess the likelihood of this possibility that the sample data is representative of the population data. This itself makes hypothesis testing very significant as it helps us assess the population parameters using the sample statistics. Hypothesis tests can be used across Define, Measure, Analyze and Improve phase of an improvement project Define Phase : To test whether the target set is significantly different from the baseline performance. Measure phase : Understanding the likelihood that a data sample comes from a population that follows a given probability distribution (i.e. normal, exponential, uniform, etc.) Analyse Phase : For screening potential causes. Evaluating several process factors (process inputs, or x’s) in a designed experiment to understand which factors are significant to a given output, and which are not. Improve phase : Evaluating a proposed process improvement, using pilot study output, to see if its effect is statistically significant, or if the same improvement could have occurred by random chance. Thanks Jisha Nair

There is no single body designated to provide Six Sigma certification to the quality profession. Almost every one of the tens of companies providing Six Sigma training and consulting also provides certification. Why is this? Because individuals and companies are spending a great deal of money, sometimes in excess of $30,000 per individual, to become trained, and they feel like they should have something to show for it. Hence, certification became a popular add-on service for consulting companies because it allowed them to differentiate between skills levels, as well as charge additional fees. The reasons for certification are the same for any other certification: to display proficiency in the subject matter to increase desirability by employers to potentially increase your salary Ultimately, certification is a professional decision that can only be made by you. In some cases, it will be required for you to advance within an organization. For instance, at some companies, it is a requirement of every salaried employee to be Green Belt trained and certified if they want to be promoted within the organization. In other cases, Six Sigma certification will display your energy and intent to be a leader within the quality profession. from the site: six sigma اسید هیومیک