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What portion of GDP does agriculture in the United States currently generate?
Time-Series Designs
Research methods that involve repeated observations of the same variables (e.g., individuals) over short or long periods of time.
Quasi-Experimental Designs
Study frameworks that aim to identify causal relationships but do not incorporate random allocation to intervention and comparison groups.
Nonrandomly Formed Groups
Groups in a study that are created based on criteria other than random assignment, which can introduce biases or preexisting differences between groups.
One-Group Posttest-Only Design
An experimental design where a single group is exposed to an intervention and then tested, lacking a control group for comparison.
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