No, Pie chart is not reflecting the true picture. There was a motive of misrepresentation and manipulation of data. It reflects dishonesty of the hospital managers. In my opinion, they should have used pie chart but mentioning the absolute number as well.

Yes, there was a motive of misrepresentation and manipulation of data. It reflects dishonesty of the manager. In my opinion, he should have used either percentage bar diagram or pie chart as both show relative changes and will show the true picture.

In one-dimensional diagrams or charts, only the length of the bar is taken into consideration. But in two-dimensional diagrams, both its height and width are taken into account for presenting the data. These diagrams, also known as surface diagrams or area diagrams.

Deviation bar charts are suitable for presentation of net quantities in excess or deficit such as profit, loss, import, or exports. The excess (or positive) values and deficit (or negative) values are shown above and below the base line. These are also called Bilateral Bar Diagrams. Three examples where these can be used:
(a) To show profit or loss of a company;
(b) To show balance of trade of a country;
(c) To show balance of inflow and outflow of cash in a company.

Sometimes we have such a series in which all values except one are approximate to each other. One value is exceptionally high. In order to provide proper shape, the larger bar is broken at the top and the value of each bar is written on the top. Its purpose is to:
(a) save time
(b) Save space and
(c) To give a proper shape to the diagram

It has been rightly said that a diagram is worth 100 words. It is easier to forget words but it is difficult to forget a diagram once seen. Diagrams have a memorizing effect on human mind. It gives a bird's eye view of the statistical details.

Different types of two-dimensional diagrams have been explained below: Rectangles: Since area of a rectangle is equal to the product of its length and width, while making such type of diagrams both length and width are considered. Rectangles are suitable for use in cases where two or more quantities are to be compared and each quantity is sub-divided into several components. Squares: To construct a square diagram, first the square-root of the values of various figures to be represented is taken and then these values are divided either by the lowest figure or by some other common figure to obtain proportions of the sides of the squares. The squares constructed on these proportionate lengths must have either the base or the center on a straight line. The scale is attached with the diagram to show the variable value represented by one square unit area of the squares. Circles: Circles are alternatives to squares to represent data graphically. The circles are also drawn such that their areas are in proportion to the figures represented by them. The circles are constructed in such a way that their centers lie on the same horizontal line and the distance between the circles is equal. Since the area of a circle is directly proportional to the square of its radius, the radii of the circles are obtained in proportion to the square root of the figures under representation. Thus, the lengths that were used as the sides of the square can also be used as the radii of circles.

Objectives of diagrams is to:
(a) Save time and energy;
(b) Forecast future events;
(c) Compare different items and components.
(d) Make data simple and comparable

Some uses of the diagrams are as follows:
(a) Attractive and Impressive: Diagrams are attractive and impressive.
(b) Simple and easily understandable:
Diagrams are easy and simple to understand. Knowledge of mathematics is not required to understand diagrams.
(c) Useful in Comparison: Diagrams prove very useful in comparing data from one year to another or otherwise.
(d) Helps in forecasting: It helps us to predict future values on the basis of past statistics.
(e) Save time effort and energy: By simplifying data, diagrams save time, energy and effort.
(f) Diagrams are useful in all fields: From sports to education to medical and engineering, in all fields we make use of diagrams. They are specifically useful for policy formulation and decision making.

Pie chart
 

Percentage of expenditure on different items

Worker Population Ratio in India 1999-2000