Question

Discuss the utility and limitations of graphic method of presenting statistical data.

Answer 1

Merits of a Graph

• The graph presents data in a manner which is easier to understand.
• It allows us to present statistical data in an attractive manner as compared to tables. Users can understand the main features, trends, and fluctuations of the data at a glance.
• A graph saves time.
• It allows the viewer to compare data relating to two different time-periods or regions.
• The viewer does not require prior knowledge of mathematics or statistics to understand a graph.
• We can use a graph to locate the mode, median, and mean values of the data.
• It is useful in forecasting, interpolation, and extrapolation of data.

Answer 2

• The graph presents data in a manner which is easier to understand. 
• It allows us to present statistical data in an attractive manner as compared to tables.
• Users can understand the main features, trends, and fluctuations of the data at a glance. A graph saves time. 
• It allows the viewer to compare data relating to two different time-periods or regions. 
• The viewer does not require prior knowledge of mathematics or statistics to understand a graph. 
• We can use a graph to locate the mode, median, and mean values of the data. It is useful in forecasting, interpolation, and extrapolation of data.

• A graph lacks complete accuracy of facts.
• It depicts only a few selected characteristics of the data.
• We cannot use a graph in support of a statement.
• A graph is not a substitute for tables.
• Usually, laymen find it difficult to understand and interpret a graph.