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The population standard deviation, generally notated by the Greek letter lower case sigma, is used when the data constitutes the complete population. It is difficult to answer your!Sep 26, 2017 · In other words, Ïx is the exact standard deviation of the data given (with n in the denominator), and sx is an unbiased estimation of the standard deviation of a l|å¨æ¥å¸¸çç§ç æ°æ®å¤çä¸ï¼æ们ç»å¸¸ä¼æ¥è§¦å°æ¹å·® (variance/deviation Var)ãæ åå·® (Standard Deviation)ãæ å误 (Standard Error)åæ½æ ·æ¹å·® (Sampling V