- Population
The set of all observations or objects in a particular category or group is called
population.
Eg. : People, Animals, Countries, etc.
The idea may be taught orally with the provision of text material in braille. - Sample
The sample is the true representative of the population.
Eg. : If students of a particular grade, say X, studying in a region is the population,
then the students of grade X studying in a particular school of the region may be treated
as a sample. - Primary data
When data are collected from the elements of the population, that is when the data is
collected from the primary source, it is called the primary data.
Eg. : In a particular class of students, if the heights of the students are measured and
noted then it is a primary data. - Secondary data
The data obtained from a secondary source, not collected directly from the population,
are called secondary data.
Eg. : In the same class of the students, if the heights of the students are noted based
on the earlier records maintained by the school, then such a collection is said to be a
secondary data. - Raw data
Data presented in the form as it is collected, is called raw data or ungrouped data.
Eg. : The marks obtained by 20 students of grade 10 of a particular school in a maths
test is as follows:
singke
(singke)
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