# In bar graphs the order of the categories does not

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In bar graphs, the order of the categories does not usually matter. However, bar graphs that have categories arranged in decreasing order of frequency help prioritize categories for decision-making purposes in areas such as quality control, human resources, and marketing. Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics Histogram It is constructed by drawing rectangles for each class of data. The height of each rectangle is the frequency or relative frequency of the class. The width of each rectangle is the same and the rectangles touch each other. It is a graph used to present quantitative data, is similar to the bar graph. It is use to organize continuous data. stat500/lesson/1/1.6/1.6.2
Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics It is a circle divided into sectors. Each sector represents a category of data.The area of each sector is proportional to the frequency of the category. Pie charts are typically used to present the relative frequency of qualitative data. Inmost cases the data are nominal, but ordinal data can also be displayed in a pie chart. Pie Chart Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics When should a bar graph or a pie chart be used? Pie charts are useful for showing the division of all possible values of a qualitative variable into its parts . Bar graphs are useful when we want to compare the different parts , not necessarily the parts to the whole. Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics A graph that shows information that is connected in some way (such as change over time) Line segments are then drawn connecting the points. It is use to organize continuous data. Very useful in identifying trends in the data over time. Line Graph
Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics The simplest of line graphs is the single line graph, so called because it displays information concerning one variable only, in terms of its frequencies. Example: Simple Line Graph Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics Multiple line graphs illustrate information on several variables so that comparison is possible between them. Multiple Line Graph Example: Polytechnic University of the Philippines College of Science Department of Mathematics and Statistics Guidelines for Constructing Good Graphics Title and label the graphic axes clearly, providing explanations if needed. Include units of measurement and a data source when appropriate.
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