Best statistical data diagram to depict Incidence change over a period of time is: (A) Pie cha, (B) Histogram, (C) Scatter diagram, (D) Line diagram
Answer is D. 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.