Hello my hard rocking amigos! I have a question about standard error. If I had a single sample, I could infer the population mean by using the sample standard deviation (n-1 version of s.d.), and then dividing this by the square root of the sample size to get the standard error, which can be used to determine how likely the actual population mean falls within a certain 'range' of the sample mean (using confidence intervals). I was hoping someone could expand on HOW the SE works. Is it just 'guessing' the standard deviation of the population based on a normal distribution? I really need to get this so any help appreciated. I may well have more questions concering the SE if I can just establish this point! Thanks as always!!!