In probability and statistics, Student's t-distribution (or simply the t-distribution) is any member of a family of continuous probability distributions that arise when estimating the mean of a normally distributed population in situations where the sample size is small and the population's standard deviation is unknown. It was developed by English statistician William Sealy Gosset under the pseudonym "S… WebCompany Description. PowerRail Distribution Incorporated is a certified AAR M-1003 distributor, manufacturer and remanufacturer of aftermarket locomotive parts, offering a wide range of products. We are North America’s leading aftermarket parts provider. In addition to our broad locomotive line, we also provide products for Passenger Transit, …
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