What is a Process?
If you speak to a small business owner about their capability to manage a grocery store, you will constantly find that they feel that they have a shortage of time. It is not uncommon for them to erroneously omit certain activities. This negligence in turn causes bad customer service or increased costs to customers. On […]
The Impact of AMLO Win on the Mexican Economy
Andres Manuel Lopez Obrador, popularly known as AMLO, is no stranger to Mexican politics. He has already run for the office of President twice in the past. Both times, he has failed to secure the top job in Mexico. However, in 2018, it was AMLO’s chance to create history. He has become the first left-leaning […]
International Logistics – A brief introduction
Supply Chains ride on Logistics Networks and IT Applications/Internet. In this topic a brief introduction to each of the Logistics Function/Industry is attempted. The foundation of logistics function is based mainly on Transportation by Road, Rail, and Air & Sea. Maritime trade has existed since times immemorial. History is replete with the major maritime routes […]
Information Technology – A Key Driver of SCM
Supply Chain Management is a broad-based function that encompasses all business and operational processes involved in but not limited to Procurement, Manufacturing, and Finished Goods Transportation, warehousing & Distribution and Inventory Management. In a globalized business scenario characterized by Geographically spread markets, raw material procurement sources across the world and cheaper manufacturing and labor markets […]
Innovation in the Digital Age: Some Issues and Observations
What is Innovation and how did it evolve? Innovation is commonly known and defined as the ability or skill to improve existing processes and to come up with a better way of doing things. On the other hand, the invention is understood to be an entirely new way of doing things. Thus, whereas innovation is […]
Hypothesis testing is one of the statistical method used to confirm the effect that critical few inputs have on the outputs. Hypothesis testing must be used when the inputs are measured discretely. The outputs may be discrete or continuous. However the inputs must be discrete, if the inputs are continuous then correlation and regression testing may be used. The fundamentals of framing a hypothesis have been explained in this article:
Any hypothesis testing always has two hypothesis, the null and the alternate hypothesis. The null hypothesis testing shows no relation between the samples, whereas the alternate test accepts the existence of a relationship. Hypothesis testing therefore considers both the possibilities. It statistically reaches a decision as to which of the two hypothesis is valid.
The very name null signifies zero. The null hypothesis therefore implies no relationship in the variable parameters that are being measured. The null hypothesis states that there is no significant difference in the samples being measured.
For instance consider a sample of people being served at Branch A of a bank and customers being served at Branch B of the bank and service level is the parameter being measures. The null hypothesis will state that there is no statistically significant difference between the service levels at Branch A and Branch B.
Similarly the null hypothesis can be written for multiple branches. It can state that there is no statistically significant difference in the service levels of Branch A, Branch B, Branch C, Branch D and Branch E.
The alternate hypothesis by its definition is the one that is opposed to the null hypothesis. We never select the alternate hypothesis. When we reject the null hypothesis, the alternate hypothesis automatically gets selected. There are various types of hypothesis like:
It is important to understand whether the alternate hypothesis should be written in the directional or non-directional form. This is because the statistical tests being used at the background change significantly.
Formulating the problem correctly maybe the most important role for the Six Sigma project person in the analyze phase. This is because there are tools which can automatically solve the problem, but that is only after they have been correctly formulated.
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