Now the mean value of this the mean-- let me write it-- the mean of the sampling distribution of the sample mean this x bar-- thats really just the sample mean right over there-- is equal to if we were to do this millions and millions of times. Means all the numbers in the data set. I have another video where I discuss the sampling distribution of the sample.
S x.
Given a sample of size n consider n independent random variables X1 X2 Xn each corresponding to one randomly selected observation. The capital Greek letter sigma 𝚺 is commonly used in mathematics to represent a summation of all the numbers in a grouping. Means all the numbers in the data set. N is the number of terms in the sample.