A confidence interval addresses this issue because it provides a range of values which is likely to contain the population parameter of interest. Confidence levels. Confidence intervals are constructed at a confidence level, such as 95 %, selected by the user.
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Graybar is an American employee-owned corporation, based in Clayton, Missouri. It conducts a wholesale distribution business for electrical, communications and data networking products, and is a provider of related supply-chain management and logistics services.