Types of sampling risks, Project Management

Assignment Help:

Types of Sampling Risks

A guarantee that every defective item in a lot would be found cannot be stated by neither sampling nor 100% inspection, 100% inspection has the risk of monotony and other factors that will result in the inspectors missing some of the defectives. Both the risks can be quantified.

Sampling risks are of two types:

  • Good lots can be rejected (the producer's risk) this risk corresponds to α-risk. The producer here is also known as Supplier alternatively.
  • Bad lots can be accepted (the consumer's risk). This risk corresponds to β- risk.

The supplier's risk is the risk that corresponds to a batch of high quality products and is being rejected due to the risks involved. The consumer risk is the risk that a batch of low quality products would be accepted.

The method of making decisions using experimental data is called as statistical hypothesis test. Hypothesis test often confuses people but is the key factor of most statistical applications. Statistical tests split significant effects form mere luck or random chance. All hypothesis tests have unavoidable, risks of making the incorrect conclusion. They always involve Type I (producer's or α) and Type II (consumer's or β) risk. The Type risk is the chance of confirming that a major effect is present when it isn't. The Type II risk is the chance of not detecting a major effect when one exists. The figure explains the types of risks in detail:

1953_sampling risk.png

Figure : Types of sampling risks

α-risks: in case of statistical testing, the significance level, Type I risk, or also called as α-risk is the "reasonable doubt".  It is the chance of wrongly rejecting the quality when it is appropriate.  In case of acceptance testing, it is the producer's risk or risk of rejecting a lot that meets requirements.

β - risks: In case of statistical testing, the Type II risk, is also called as β-risk. The Type II risk is the chance of accepting the quality when it is inappropriate. The "consumer's risk" is the Type II risk for an acceptance sampling plan. It is the chance of passing a lot that does not meeting the requirements.


Related Discussions:- Types of sampling risks

Briefly elaborate on the importance of a project charter, QUESTION (a) ...

QUESTION (a) Accurate estimation is crucial for effective planning and control and is associated with time, information, experience of estimator, techniques used and funding. D

Elaborate the four possible choices in allocating the risk, QUESTION Ri...

QUESTION Risk is inherent to all projects. With increasing market competition, technology and globalisation, risk management is continuously gaining wider acceptance and import

Production planning, PRODUCTION PLANNING AND SCHEDULING OF A GARMENTS MANUF...

PRODUCTION PLANNING AND SCHEDULING OF A GARMENTS MANUFACTURING COMPANY 1. Introduction TREND SHOPS SDN BHD is a manufacturing unit of (mid-upmarket) ladies garments.  It

Describe the key characteristics of a good project, Question 1: a. How...

Question 1: a. How would you define a project? What are the different types of project that exist? (Please illustrate using a model with examples). b. Enumerate and descri

What do you meant by change of scope in a project, Question: (a) (i) Wh...

Question: (a) (i) What do you meant by "a change of scope" in a project? (ii) Unplanned changes (for e.g, unplanned expenses) might occur during the implementation phase of

Draw a control chart for the number of defects, Explain the concepts involv...

Explain the concepts involved in Product Layout and its advantages and disadvantages vis-a-vis process layout. 18 carpets were observed closely and the number of defects in thei

How do i get my project organized, Q. How do I get my project organized? ...

Q. How do I get my project organized? Every project that involves surplus to one person requires a project team to get the work done. With no doubt building a motivated project

Project contracts, Understanding Project Contracts  Project contracts i...

Understanding Project Contracts  Project contracts invariably involve construction and therefore we will discuss contracts necessarily involving construction in this section. I

Benefits of value management over entire project lifecycle, Question: (...

Question: (a) Project Value Management has gained significant acceptance in different fields of business and is regarded as a useful tool for promoting project sustainability

What is the purpose of the post completion review, What is the purpose of t...

What is the purpose of the post completion review? The purpose of a PC (post completion) review: • Assist continuous improvement for example review procedures to design bett

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd