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In this video we are going to introduce you
to How to describe the data with graph?
Basically the data can be described or represented
by the graph in four ways  ...and
they are
Bar graph ,pie graph or pie chart , Line diagram
and box plot
In this video we will basically deal with
bar graph
Lets start with the bar graph:
It consists of horizontal axis and vertical
axis.
Lets draw a vertical axis and vertical axis
It is used for the representation of data
with two variable at each axis
where one of them must be categorical and
other must be numerical variable else we cannot
construct
so always keep in mind before constructing
bar graph for any data .
Generally categorical value lie at horizontal
axis and numerical variable lies at vertical
axis
but oppposite can also be done.
Between the axis The data is represented by
a rectangular
boxes whose width are same with equal spacing
but with different
height depending on their numerical value.
and we can also place the categorical variable
in vertical axis and numerical variable in
x-axis but it tends to give unfmiliar and
complex look
so in most of the cases we stich with our
previous method.
Lets us view a exampe of how bar graph is
made.
Let us draw a bar graph for the the sports
vs the number of people who likes the particular
sport the most.
So lets refer to this data where the first
column consists of sports name and second
colum consists of number of
vote .Here sports is the categorical variable
and vote is the numerical
variable and since we can draw a bar graph
only between categorical variable and numerical
variable.
Thus we can construct bar graph for this data
.
So in the graph we draw a vertical axis and
horizontal axis, and put numberical variable
o votes
in the vertical vaxis which contains a number
line with the increasing interval of 5 for
each boxes and put the categorical variable
sport i.e football ,
basketball and volleyball in the horizontal
axis .
Now we are ready to construct the bar graph.
In the data corresponding to football we have
20 votes,thus we draw rectangle of height
20 above football ,
Similary corresponding to basketball we have
45 votes , thus we draw rectangle of height
45 above basketballand
corresponding to volleyball we have 80 votes,
thus we draw rectangle of height 80 above
volleyball
Also note two thing : First the width of all
the rectangles must be equal
second the spacing between each rectangle
should be equal for attractive and sysytematic
look
Thus we have constructed our bar graph ...
So we have done our best to explain about
bar graph.
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