Graphs By Saira Imran DA SKBZ College July 20 th 2011.

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Presentation transcript:

Graphs By Saira Imran DA SKBZ College July 20 th 2011

Different Types of Graphs Tables, charts and graphs are convenient ways to clearly show your data. A graph is a visual display of numeric values. A graph is a picture. Graphs make numbers and numbers comparison more understandable. Graph summarize data, show trends and display patterns.

The cafeteria wanted to collect data on how much milk was sold in 1 week. The table below shows the results. We are going to take this data and display it in 3 different types of graphs.

Circle (or Pie) Graph There are three basic graph forms. Notice how each of the following examples are used to illustrate the data. Choose the best graph form to express your results. Bar Graph Line Graph

Bar Graph A bar graph is used to show relationships between groups. The two items being compared do not need to affect each other. It's a fast way to show big differences. Notice how easy it is to read a bar graph.

Circle Graph or Pie Graph A circle graph is used to show how a part of something relates to the whole. This kind of graph is needed to show percentages effectively.

Line Graph A line graph is used to show continuing data; how one thing is affected by another. It's clear to see how things are going by the rises and falls a line graph shows.

Bar Graph Line Graph Circle (Pie) Graph The same data displayed in 3 different types of graphs.

On what day did they sell the most chocolate milk? a. Tuesday b. Friday c. WednesdayTuesdayb. Friday Wednesday

OOPS !Wrong Answer Look for the tallest bar

On what day was the least amount of chocolate milk sold? a. Monday b. Tuesday c. ThursdayMondayTuesdayThursday

OOPS! Wrong Answer Look for the smallest slice

On what day did they have a drop in chocolate milk sales? a. Thursday b. Tuesday c. MondayThursdayTuesdayMonday

OOPS! Wrong Answer Look for the drop on the line

Choosing the Right Graph Use a bar graph if you are not looking for trends (or patterns) over time; and the items (or categories) are not parts of a whole. Use a pie chart if you need to compare different parts of a whole, there is no time involved and there are not too many items (or categories). Use a line graph if you need to see how a quantity has changed over time. Line graphs enable us to find trends (or patterns) over time.