This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
A Scatter diagram is drawn to study 
Select and explain. 
A. Trend of a variable over a period of time, B. Frequency of occurrence of events, C. Relationship between two given variables, D. Mean & median values of the given data
C: Relationship between two given variables
Answer: C: Relationship between two given variables 
Explanation: SCATTER DIAGRAM
• Also known as ‘Correlation diagram’ or ‘Dot diagram’
• Is used to depict ‘correlation (relationship) between 2 quantitative variables’
• The vertical axis in the scatter diagram: should be the dependent or the outcome variable
• In a scatter diagram, 2 imaginary lines are drawn along the distribution of dots/scatter