The curve obtained by plotting cumulative frequencies is called an ____________. 

__________ refers to the collection of information by on individual or group of individuals through direct observations in the field. 

To draw meaningful inferences and to make them usable the _________ requires tabulation and classification. 

In ___________ method, a value equal to the upper limit of a group is included in the same group. 

The person involved in conducting the _________ should be clear about the objective of the survey. 

Data collected from any published or unpublished sources are called ____________.

A graph of frequency distribution is known as the ___________. 

____________ is a systematic arrangement of data in columns and rows. 

__________ include government publications, documents and reports. 

___________ are collected, tabulated and presented in a tabulated form either in absolute terms, percentages or indices.