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PEMDAS- Parentheses, Exponents, Multiplication and Division, Addition and Subtraction
Before conducting an experiment, a math problem or series of calculations one usually writes down what their expectations are that a certain result will come from the calculations or experiments. This is called a Hypothesis. You then conduct the experiment or set of calculations, in order to find out whether your expectations, based on your estimations, were correct, or wrong.
No. The interval level is more refined and so enables calculations which are not available at the nominal level.
In general, the associative property states that "a · (b · c) = (a · b) · c" for some operation "·". In other words, if an operation is associative, the order in which multiple calculations involving it are performed is irrelevant.
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