With iodide, the solvate $\ce{NaI \cdot 3(CH3)2CO}$ can be formed, in which each $\ce{Na+}$ is coordinated by 6 acetone ligands via oxygen lone pairs, and the $\ce{I-}$ ions fill in the gaps between these octahedral units, being surrounded by the methyl groups of the acetones.
Randomization is a sampling method used in scientific experiments. It is commonly used in randomized controlled trials in experimental research.
Social Security Number Randomization. On June 25, 2011 the Social Security Administration changed the way Social Security Numbers are issued. Originally Social Security Numbers reviled information about the owner of that numbers. Here you can learn more about Decoding Social Security Numbers.