Answer the question.Which of the following describes a study in which the participants naturally form groups by choice?
A. Observational study
B. Double-blind experiment
C. Single-blind experiment
D. Case-control study
Answer: D
Mathematics
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Simplify the following. Leave answer as a power.313 ? 3033 ? 1013
A. 3046 B. None of these C. 3033 ? 1026 D. 3033 ? 1013
Mathematics
Find the mode or modes.5, 9, 85, 3, 2, 8, 46, 1, 4, 16
A. No mode B. 8 C. 9 D. 17.3
Mathematics
Find the difference.(0.67) - (-0.17)
A. -0.4 B. -0.1139 C. 0.84 D. -0.5
Mathematics
Match the equation with the appropriate graph.x = -y
A. 
B. 
C. 
D. 
Mathematics