Anna does not need to get a sample in every box.
The process of sampling involves taking out a representative quantity of the whole in order to study the properties of the whole.
The sample taken for study must reflect the properties of the whole. It must be taken in such a way that all parts of the whole are represented.
Recall that Anna had six recipes from which she made 30 boxes; five boxes of caramel bar of each recipe.
She may collect two caramel bars at random from any of the five boxes containing a particular recipe.
This means that Anna will have a total of 12 caramel bars for sampling.
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