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.
Zaizai Lu, AstraZeneca Pharmaceuticals. ABSTRACT. Randomization is of central importance in clinical trials. It prevents selection bias and. insures against accidental bias. It produces comparable groups, and eliminates the source. of bias in treatment assignments. Finally, it permits the use of probability theory to.