The variance of 5 numbers is 10. If each number is divided by 2, then the variance of new numbers is______________?

A. Among all other test of size α or less it has the largest power
B. Among all other test of size α or greater it has the largest 1 – α
C. Among all other test of size α or greater it has the smallest power
D. Among all other test of size α or greater it has the largest β

A. (U)
B. 6
C. Ux
D. 6/√n