Maths 3 Mark Question

The word data means information statistical data and are of two types:

1. Primary data:

When an investigator collects data himself with a definite plan or design in his or her mind is called Primary Data.

2. Secondary Data:

Data which are not originally collected rather obtained from published or unpublished sources are called secondary data.

Secondary data are collected by an individual or an institution for some purpose and are used by someone else in another context.

Primary data are reliable and relevant because they are original in character and are collected by some individuals or by research bodies.

Fundamental characteristics of statistics:

1. A single observation does not form statistics. Statistics are a sum total of observations.
2. Statistics are expressed quantitatively not qualitatively.
3. Statistics are collected with definite purpose.
4. Statistics in an experiment are comparable and can be classified into groups.