Draw or construct the graph

Select the appropriate graph:

Pie chart – is used for percentages, ratio     and proportion, rates and derived data
Bar graph is used for categorical data.
Histogram – is used for data measured on   an interval scale
Frequency polygon – is used for continuous data and is similar to histogram . It is obtained from histogram by joining the  midpoints of the top of each bar.

Cumulative plot -  depicts a set of   quantitative data. The horizontal scale   is the data values while the vertical   scale indicates the proportion of the   observation less than or equal to a   particular value
Scatter plot or scatter diagram – illustrates   effectively the relationship between two   measures. In it every point represents a   pair of values, such as values of   different measures taken on the same   person.

  • Line graph - is used for continuous range   of measurement. It allows one to   interpolate or infer the value of points   on a graph that were not directly   measured. It is appropriate for data   where intervals of recorded data have   meaning
  • Tree diagram – is used oftenly to help in   making decisions. It displays in   temporal sequence possible types of   actions or outcomes.
Always be reminded that the independent variable is placed in the x-axis while the dependent variable is placed in  y-axis of the graph.


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