It shows the frequency of occurrence of different

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Unformatted text preview: e frequency of occurrence of different values of a single Phenomenon. A frequency distribution is constructed for three main reasons: 1. To facilitate the analysis of data. 2. To estimate frequencies of the unknown population distribution from the distribution of sample data and 3. To facilitate the computation of various statistical measures 4.2 Raw data: The statistical data collected are generally raw data or ungrouped data. Let us consider the daily wages (in Rs ) of 30 labourers in a factory. 80 70 55 50 60 65 40 30 80 90 75 45 35 65 70 80 82 55 65 80 60 55 38 65 75 85 90 65 45 75 The above figures are nothing but raw or ungrouped data and they are recorded as they occur without any pre consideration. This representation of data does not furnish any useful information and is rather confusing to mind. A better way to express the figures in an ascending or descending order of magnitude and is commonly known as array. But this does not reduce the bulk of the data. The above data when formed into an array is in the following form: 30 35 38 60 60 65 75 75 75 40 65 80 45 65 80 45 65 80 49 50 65 80 55 65 85 55 70 90 55 70 90 The array helps us to see at once the maximum and minimum values. It also gives a rough idea of the distribution of the items over the range . When we have a large number of items, the formation of an array is very difficult, tedious and cumbersome. The Condensation should be directed for better understanding and may be done in two ways, depending on the nature of the data. a) Discrete (or) Ungrouped frequency distribution: In this form of distribution, the frequency refers to discrete value. Here the data are presented in a way that exact measurement of units are clearly indicated. There are definite difference between the variables of different groups of items. Each class is distinct and separate from the other class. Non-continuity from one class to another class exist. Data as such facts like the number of rooms in a house, the number of companies registered in a country, the number of children in a family, etc. The process of prepa...
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This note was uploaded on 01/18/2014 for the course BUS 100 taught by Professor Moshiri during the Winter '08 term at UC Riverside.

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