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AIOU SOLVED ASSIGNMENT 1 CODE 1430 STATISTICS FOR MANAGEMENT
DIFFERENT METHODS OF PRESENTATION OF STATISTICAL DATA
1) UNGROUPED DATA: Suppose we have a collection of measurements given by numbers. Some may occur only once, while others may be repeated several times. For example if we write down the numbers as they appear, the processing of them is likely to be cumbersome. This is known as “UNGROUPED (OR RAW) DATA”.
2) RANKED DATA: A slightly more convenient method of tabulating a collection of data would be to arrange them in rank order, so making it easier to see how many times each number appears. This is known as “RANKED DATA”.
3) FREQUENCY DISTRIBUTION TABLES: Thirdly, it is possible to save a little space by making a table in which each individual item of the ranked data is written down once only, but paired with the number of times it occurs. The data is then presented in the form of a “FREQUENCY DISTRIBUTION TABLE”.
4) GROUPED FREQUENCY DISTRIBUTION TABLES: For about forty or more items in a set of numerical data, it usually most convenient to group them together into between 10 and 25 “class” of values, each covering a specified range or “class interval” (for example, 7.50 – 10.5, 10.5-13.5, 13.50 -16.50…..). Each item is counted every time it appears in order to obtain the “class frequency” and each class interval has the same “class width”. Too few classes means that the data is over summarized, while too many classes means that there is little advantage in summarizing at all.
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