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Annual demand for the notebook binders that Ted's Stationery Shop sells is 10,000 units. Ted operates his business on a 200-work-day year. The unit cost of a binder is $2, and the cost of placing an order with his supplier is $0.40. The cost of carry­ing...

When groups of data are separated, an association can get stronger because of a lurking variable. That lurking variable is usually the number of observations in the different groups of data.