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- Introduction
- Background
- Why Is It Important
- Expanded Uncertainty
- Coverage Factors
- Conclusion
- References
Expanded uncertainty and coverage factors are an important part of calculating uncertainty. Calculating them is not very difficult, but coverage factors can be a little confusing. To prevent you from using the wrong coverage factor to calculate expanded uncertainty, I have prepared this article to show you how to find the right coverage factor for ...
When I started calculating uncertainty, I followed the recommendation of assessors to use a coverage factor of 95% where k=2. However, while I was in graduate school taking “Statistics for Quality Control” I realized a 95% confidence interval really has a k factor equal to 1.96, not 2. So, I spent some time using the Student’s T table and calculati...
The goal of calculating expanded uncertainty is to establish a confidence interval where your measurement results have a likelihood of occurring. To accomplish this, you need to know 2 things: 1. How much confidence do you want? 2. What is your calculated combined uncertainty? So, the first question aims to establish how confident do you want your ...
Expanded uncertainty is the last calculation when estimating uncertainty in measurement. Typically, it is very easy and only requires you to multiply the combined uncertainty by a desired coverage factor. However, before I jump into how to calculate expanded uncertainty, let’s learn a little more about it. The best place to start is by defining exp...
Coverage factors are important when calculating uncertainty. However, most of you probably just choose a 95% confidence interval and use k=2. Am I Right? Well, have you ever stopped to think about why we use k=2 or how much confidence a value of 2 gives you? What if I told you that k=2 is really equal to a confidence interval of 95.45%, not 95%. If...
Calculating expanded uncertainty and coverage factors are an essential task to estimating uncertainty. It is important that you select the appropriate coverage factor for your uncertainty analysis. So, be sure to use the tools that I have provided for you. It will make the uncertainty estimation process much easier for you. Now, leave a comment bel...
JCGM. (2012). International Vocabulary of Metrology: Basic and General Concepts and Associated Terms. Sèvres: BIPM.
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