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The Pearson product-moment correlation coefficient, r, requires that variables are measured with:
Allowances
Discounts or financial concessions given to customers, employees, or distributors as an incentive or for defective goods.
Cumulative Quantity Discounts
Price reductions applied to purchases based on the accumulated quantity bought over a specific time period, incentivizing larger orders.
Noncumulative Quantity Discounts
Price reductions given for a single purchase order rather than over a period of time, based on the quantity of goods purchased.
Noncumulative Quantity Discounts
Discounts that apply to a single order rather than the total volume of orders over a certain period, encouraging large individual purchases.
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