Consider a population of 3 units having values 2, 4 and 6. A simple random sample (without replacement) of 2 units is to be drawn from the population. Let M denote the sample mean of this sample. Then which of the following statements are true?
1
E(M) = 4
2
E(M2) = 17
3
E(M3) = 72
4
Var(M) = 1