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1. ### Extrapolation - Getting info of a population from a sample

Ok, I understand then, thank you!
2. ### Extrapolation - Getting info of a population from a sample

Your example totally illustrates my problem. You say that the mean of the population is 180 cm and it's standard deviation sigma=7cm. then you take a sample and use s/√(n) to calculate the standard error. But why do you say s=7? Why would the estimate of sigma be directly equal to sigma? In...
3. ### Extrapolation - Getting info of a population from a sample

Ok, thank you! So you use the fact that sigma=s*√(n/(n-1) ? Otherwise would you have any leads to find the standard deviation error or do I stick with the formula I just wrote?
4. ### Extrapolation - Getting info of a population from a sample

Hello, I'm working on a problem where I have 30% of a full dataset and I have to estimate the generalization error. To be more precise, let's say I have the information of the transactions of the clients of a bank which has 30% of the countries market. I can easily get the mean, standard...