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.
Psychology Dictionary a b c d e f g h i j k l m n o p q r s t u v w x y z random allocation: refers to the how experimenters divide participants into each experimental condition, to reduce any bias in the distribution of participant characteristics. random sample: a technique for obtaining participants, whereby every member of the population has an equal chance of being selected.