This document defines key terms related to data collection and analysis: - Primary data is collected directly by the investigator, while secondary data is collected by someone else. - Raw data is organized and condensed into grouped or ungrouped frequency distributions. - Variables are characteristics that can take different values. Class intervals are the groups into which raw data is condensed. - Other terms defined include upper and lower class limits, class width, range, mean, median, and mode.

2. It is the science which deals with the or
The word data means information
collection, presentation, analysis figures
set of given facts in numerical and
interpretation of numerical

3. Secondary Data The data collected byby someone,
Primary Data : : The data collected the
other than the investigator, definite plan in mind are
investigator himself with a are known as
secondary primary data
known as data

4. Putting thecondenseraworiginal tables,orin
An arrangement of the form ofclassesare groups.
in
We data obtained in numerical data called
The may data, in data into form occurs is
The number of times an observation
condensed or descendingknown ofpresentation is
ascending form, is knownorder asmagnitude, of
Suchits presentation is as the grouped data
ungrouped data
called a frequency
data an array
called

5. A frequency distribution in which each upper limit as
A frequency distribution in which each upper limit
well as lower limit isand lower limit is included
of class is excluded included

6. Any character which is capable of taking several different
values is called a variable
Each group into the raw data is
condensed, is called class interval
The difference between the true
upper limit and the true lower
limit of a class

7. Upper limit + lower limit
2
The difference between
the maximum value and
the minimum value of
the variate

8. The cumulative frequency corresponding to a class is
the sum of all frequencies up to and including that
class

13. sum of observations
Mean =
number of observations