This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Graphs, Correlation, Locations, Subject name: Social & Preventive Medicine
[{'content': 'Best statistical data diagram to depict Incidence change over a period of time is \nSelect and explain. \nA. Pie cha, B. Histogram, C. Scatter diagram, D. Line diagram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Line diagrams are used to show the trend of events with the passage of time, hence incidence change ( a trend) is best depicted by a line diagram. Other options: In pie cha, areas of the segments of a circle are compared. Extremely popular but statistically inferior to bar chas. Histogram is a pictorial diagram of frequency distribution for continuous class intervals Scatter diagrams show the relationship between two objects. Eg: Positive correlation between the intakes of fat and sugar in average diets.', 'role': 'assistant'}]