Best data collection sources

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What are the best sources of data collection for the following? 1. A bank loan officer wishes to forecast the economy of the country in which the bank operates. 2. A research project has the purpose of identifying the labor issues of concern to a union. 3. A manager must determine the best site for a convenience store in an urban area. 4. Median weeky earnings of full-time salaried workers for the range 1995-2000. 5. Annual sales of the top ten fast-food companies. 6. Number of airplane trips made by college students.