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Hi Dason, Thanks for your reply. Good questions. It's about a normal distribution. And we need to fix sample size. Say the standard deviation (SD) of the population is 8.1, is finding the probability of a sample with a calculated sample SD of 5 a legitimate question? Or we could only find...

Question: If the standard deviation of a population is known can one calculate the probability of sample with a given standard deviation calculated from the sample?