Stratified Random Sampling Differentiates All Elements in the Population on the Basis

Multiple Choice

Stratified random sampling differentiates all elements in the population on the basis of their value on some relevant characteristic, and then they are ______.

A) sorted into positive and negative forms of the element
B) disproportionately sampled within each stratum
C) sampled randomly from within these strata
D) put into a random digit dialing program to properly sample them