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Which of the following is NOT a problem associated with observational studies?
Labor and Material
Refers to the total cost of the work force (labor) and the materials used in the production of goods or the provision of services.
Transportation Costs
Expenses incurred in moving goods or materials from one location to another, including shipping fees, freight, and logistics services.
Sales Tax
A tax imposed by a government on the sale of goods and services, usually calculated as a percentage of the retail price.
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