Final answer:
The question regarding which sector has approximately 12% of the unionized workforce in the United States cannot be precisely answered with the provided data, as no exact match is found. Closest sectors are production, transportation, and material moving, as well as natural resources, construction, and maintenance.
Step-by-step explanation:
The student's question asks about the proportion of the unionized work force in the United States within a specific sector. Based on the information provided, where occupations such as the federal government, state government, local government; transportation and utilities have high percentages of union members, we can infer that one of these sectors is likely to be the correct answer. However, none of these sectors have an exact 12% unionized workforce based on the given data.
Furthermore, the data provided does not specify a sector that contains exactly 12% of the unionized work force in the United States. This implies that the question may be incomplete or requires additional information to properly answer which sector has approximately 12% of unionized workers. The closest figures to 12% are in production, transportation, and material moving (13.3%) and natural resources, construction, and maintenance (15.9%).