•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.