Nowadays, gas shielded metal arc welding (GSMAW) is widely used in various constructions. such as steel structures, bridges, autos, motorcycles, construction machinery, ships, offshore. structures, pressure vessels, and pipelines due to high welding efficiency.
A confidence interval is a range around a measurement that conveys how precise the measurement is. For most chronic disease and injury programs, the measurement in question is a proportion or a rate (the percent of New Yorkers who exercise regularly or the lung cancer incidence rate).
Associated with a confidence interval there is a confidence level or confidence coefficient. It is to be noted that the interval estimation and testing of hypothesis are two parallel developments in Statistics. It is easy to see the following result. Confidence level of a confidence interval = 1 - significance level of the associated test. i.e. Confidence level of a confidence interval = 1- Î±, where Î± is the significance level of the associated test. To make the concepts clear first, I will provide the procedure for finding a confidence interval and test construction: