This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
Scatter diagram represents- 
Select and explain. 
A. Frequency of occurence, B. Trend over time, C. Correlation / Association, D. None of the above
C: Correlation / Association
Answer: C: Correlation / Association 
Explanation: Ans. is 'c' i.e., Correlation / AssociationDataMethodFrequency of occurrenceBar Chart(comparisons of magnitude)Pie chartTrends over timeLine graphDistribution (not related to time)Histogram,Frequency polygonAssociation(Looking for correlation between two variables)Scatter diagram