It is an estimate of the probability distribution of a continuous variable. Ø If the data is presented in the numerical form, it will not attract the attention of the audience. ADVERTISEMENTS: Let us make an in-depth study of the graphical representation of statistical data. A histogram is a diagrammatic representation of data as rectangles whose area is proportional to the class frequencies and whose width is equal to the class bin/interval. In histogram, the bars are placed continuously side by side with no gap between adjacent bars. It requires a lot of skill to prepare, and some skill(s) to understand. Among this large number of joint trends and dips, it is difficult to find out the major ... • Histogram: It is based on the bases of statistics of graphical representation of data Diagrammatic Representation of Data. Ø The line diagram is the simplest method of graphical representation. Probability Histogram. 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Example: Draw a percentage bar diagram using the following data. Ø Each bar consists of several compartments. P2. In a histogram the width of the rectangle is proportional to the class interval under consideration, and the height is the associated frequency. Measure of central tendency, mode can be easily determined with the help of this graph. Ø Bar diagram is further divided into FOUR types: Ø Items are to be compared with respect to a single characteristic. While constructing a histogram, the following considerations should be made. The mid-values are measured along the x-axis and the corresponding frequencies along the y-axis. Graphical Representation of Data PPT (Line Diagram, Bar Diagram, Histogram, Frequency Curve, Ogive and Pie Chart) What is graphical representation? Ø The class intervals are taken on the X axis. It is a diagram of continuous rectangles. That is, in histogram rectangles are erected on the class intervals of the distribution. P3. Textual Mode of presentation is layman’s method of presentation of data. Diagrammatic representation of the cumulative frequency distribution is (a) Frequency Polygon (b) Ogive (c) Histogram (d) none 50. Diagrams have been used since ancient times on walls of caves, but became more prevalent during the Enlightenment. Economics Grade XI Histogram - Diagrammatic and Graphical Representation of Data The histogram is the graphical presentation of the continuous frequency distribution drawn by the help of rectangular vertical bars whose heights represent the frequencies of the classes. Being an estimate of the probability distribution of a continuous variable, the histogram was first introduced by Karl Pearson as a kind of a bar graph. 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