How to calculate sample mean and variance using Excel. Get full lessons more subjects at. The sample mean average X X1 X.
Now that were a little more advanced and we want to start distinguishing between populations and samples lets update the mean formula and say that the mean of a population is mufrac sum_ i1N x_i N m.
The sample mean average X X1 X. How to calculate the sample mean 1. The expected value of X is EX µ and the variance of X is varX s2n. Its the sampling distribution of the sample mean.