Hypothesis Testing_Chi Square Test Chi square test. What is chi square test? Chi square test is the test of homogeneity. And we have understood that earlier, right? It is used to compare the homogeneity of proportions of several groups. And here are a few of the underlying assumptions. The sample must be randomly drawn from the population. Data must be re reported in raw formats, not percentages. Measured variables must be independent of each other. Values are categories on independent or independent variables must be mutually exclusive. And it has…

AGGREGATE FUNCTIONS – GROUPS and SUBGROUPS Functions or group functions operate on multiple rows per execution and bring a single row result. During the Introduction of Functions section we saw this a little bit and now let us get to the details. For example, if I do select some population from test one, it will scan all the rows of of the population column and will add values and bring the total value in a single row. So what happens is it works on a set of rows to aggregate…

Hypothesis Testing_ANOVA_Part 1 First, there is a marketing organization which outsources their back office operations to three different suppliers. Now, the count is three, right? The contracts are up for renewal, and the chief marketing officer wants to determine whether they should renew contracts with all suppliers or any a specific supplier. Chief marketing officer wants to renew the contract of supplier who has the least transaction time. Chief marketing officer will renew all contracts if the performance of all suppliers is similar. Now go ahead and do the analysis…

Hypothesis Testing_Part 3 And understand the procedure of hypothesis testing. The acceptance of hypothesis is determined using Pvalue as follows you first come up with your null and alternate hypothesis. You select which test statistic to be used. You determine the significance level which is alpha value, right? In most cases, it is 5% or 0. 5. You determine the criteria for rejection, right? Either you do that or you calculate significant probability from test statistic. Or you calculate the test statistic. Determine whether to accept hypothesis based on statistics….

Shortlist Critical Inputs – Hypothesis Testing And here is the next step, the third step. Oh, sorry, my bad. This is the second step shortlist to identify the critical inputs. Out of the umpteen number of inputs which we have found out, we have now identified all the potential inputs. We will have to validate whether the potential inputs are critical or not using some quantitative tools. And we would be using hypothesis testing, which is a quantitative tool, by the way. We are going to prepare the data collection…

Risk Based Analysis – FMEA_Part 2 Few other definitions of SME template which we have seen current control. How are you trying to control that? Are you having any preventive mechanism? Right. How would you control that? For example, think about this I have an iron box to iron the clothes. I want to iron the clothes and I have an iron box and I forgot to switch it off. Do you think if I forget to switch it off, it’s going to be heated to a temperature of 200…

6. Risk Based Analysis Introduction Risk analysis, right? Failure mode, effect analysis, effects and analysis. We are going to look into all that now. But first let us get into the preliminaries once again, even before we get started with what is a risk, here is my question to you guys. What is the difference between risk and an issue? Risk and an issue. What is the difference between these two? You’ll know that risk is an uncertain event which has a positive or negative outcome. And risk is always…

Identify all Inputs – Qualitative, Affinity Analysis Qualitative analysis. First thing is brainstorming. Brainstorming is nothing but collecting multiple ideas from a group of members. You bring in group sorry, my mind. You bring in group of members into a room and then you ask them on what are the inputs which might potentially impact your output. You ask them, what are those x’s? And then everyone is going to give you some inputs about what is going to impact the output, right? You simply write down all the inputs….

Introduction to Analyze Phase & Agenda Welcome to the analyze phase of Lean six Sigma Green belt which is driven using Minitab. Minitab is a statistical tool which is Guid based graphical user interface. It is very easy to navigate and extensively used across the globe in most of the Fortune 500 companies needs and it is used to a very great extent in most of the universities to deliver trainings on statistics and six sigma and so on and so forth. What is analyzed face all about? Even before…

Practice Project_Part 5 Here is the next step. So the project leader, mr. He, wanted to analyze the current process to understand the critical causes for failures. In the process, the team brainstormed all possible failure modes, its effect and potential causes. They also collected data on occurrence and detection. Please carry out a suitable analysis to evaluate the risks in the current process. This is what we need to do now. And what would be the suitable analysis to evaluate the risks in six sigma or otherwise? If you…