Data Handling is the way
to maintain data in a
database system. It
involved extraction and
transformation of data
from one media to another.
In statistics, a frequency distribution is an
arrangement of the values that one or more
variables take in a sample. Each entry in the table
contains the frequency or count of the occurrences
of values within a particular group or interval, and
in this way, the table summarizes the
distribution of values in the sample.
Graphical representation of data
A bar chart or bar graph is
a chart with rectangular bars
with lengths proportional to the values that
they represent. The bars can be plotted
vertically or horizontally.
Bar charts are used for plotting discrete data
which has discrete values and is not
continuous. Some examples of discontinuous
data include 'shoe size' or 'eye colour‘ , for
which you would use a bar chart.
Double bar graphs
• A double bar graph is a bar
graph with two bars that compare
two sets of data. Don't get too
overwhelmed by the name. They
really are simple to figure out
when you look at them.
A histogram is graph that shows
data points as they apply to
various ranges. Imagine, if you
will, a graph that shows
ascending years on the column
and the amount of beer sold
monthly on the line.
A pie chart (or a circle graph) is
a circular chart divided
into sectors, illustrating proportion. In a
pie chart, the arc length of each sector
(and consequently its central
angle and area), is proportional to the
quantity it represents. When angles are
measured with 1 turn as unit then a
number of percent is identified with the
same number of centiturns.