SSC (English Medium) Class 9Maharashtra State Board
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Collection of Data

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Divide the students of your class into four groups. Allot each group the work of collecting one of the following kinds of data:
(i) Heights of 20 students of your class.
(ii) Number of absentees in each day in your class for a month.
In the first case, when the information was collected by the investigator herself or himself with a definite objective in her or his mind, the data obtained is called primary data.
In the second case, when the information was gathered from a source which already had the information  stored, the data obtained is called secondary data. Such data, which has been collected by someone else in another context, needs to be used with great care ensuring that the source is reliable.

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