Wheat Box wants to expand to South Asia.  Since South Asia is very hot and humid, it is hard to keep delicious Toastie Kings toaster pastries from spoiling.  Wheat Box decides to test different combinations of preservatives.  It creates 5 combinations of different preservatives and treat 5 different group of Toastie Kings.  For a sixth group, they keep Toastie Kings as they are.  They ship all 6 groups to Sri Lanka, store them at room temperature, and test them in 3 months to see how well they resisted spoiling.  Is this observational or experimental?

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Counting Principles

In statistics, the counting principle can be said to be the concept in which the quantity of an item is determined. There can be a single item, or a group of items, or items that are related to each other. In every possible set of items, the quantity of the possible item groups or their sorting measures can be determined with counting principles.