The manager cost of generic plavix at walgreens A good example of stating a truism and totally misusing it. That is like saying that two potato chips don’t have exactly the same calorie count, therefore there is no point in calculating nutrition information. In statistics we use measures/approximations/models to weight according to a scale. So for the purpose of measuring math abilities, we might say that two people with the same SAT score are roughly equivalent. If a large enough sample is used, the outliers will cancel each other out giving us a fairly good approximation.