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.
random. 1  proceeding, made, or occurring without definite aim, reason, or pattern: the random selection of numbers. 2  Statistics. of or characterizing a process of selection in which each item of a set has an equal probability of being chosen. 3  Building Trades.