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).
A confidence interval does not quantify variability. A 95% confidence interval is a range of values that you can be 95% certain contains the true mean of the population. This is not the same as a range that contains 95% of the values.The graph below emphasizes this distinction.The graph shows three samples (of different size) all sampled from the same population.t is correct to say that there is a 95% chance that the confidence interval you calculated contains the true population mean. It is not quite correct to say that there is a 95% chance that the population mean lies within the interval.