Our experiments with full sample space sampling distributions from a parent population reveal which of the following to always be true:

a. The mean of the sample means is always equal to the parent population mean

b. The variance of the sample Sum is always equal to n times the population variance

c. The variance of the sample mean is always equal to the variance of the population divided by n

d. The mean of the sample Sum is always equal to n times the population mean

e. All of the above are true