statistics

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

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

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

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

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

Upper limit + lower limit
2

The difference between
the maximum value and
the minimum value of
the variate

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

sum of observations

Mean =
number of observations

statistics

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