Bar GraphsCaroline LembckAnne JacobHannah Gallagher

Definition: A bar graph is a diagram in which the numerical values and data are represented by the height or length of lines or rectangles of equal width

Definition continued…

The data is displayed

using vertical or

horizontal

rectangular bars.

Outside Source:

Data:In a bar graph, only one set of data is necessary to make the graph.

That set of data is called

categorical data. Categorical data

is values that can be sorted into

groups or categories.

This does not necessarily mean that you cannot have a

number as your category. For example, if you have a bar

graph representing the different heights of people, even

though you are using numbers, it is still considered

categorical data because you categorize the data you

collect into different groups. http://www.abs.gov.au/websitedbs/CaSHome.nsf/Home/CaSQ+3A+WHAT'S+THE+DIFFERENCE+BETWEEN+NUMERICAL+AND+CATEGORICAL+DATA

Advantage #1Comparisons are easily made when using a bar graph because the data and information is easy to see. A bar graph helps visualize showing differences and making comparisons. he information is displayed in a way that helps people make generalizations and conclusions very quickly and easily.

Advantage #2Bar graphs are also very versatile and used in many different situations. There are also many types of bar graphs including broken- bar graphs and multiple bar graphs. These can be used for sets of data that are very small or very large. Multiple bar graphs represent the value of several different items.

Disadvantage #1Bar graphs might require additional explanation and might not be very accurate. The bar graph can sometimes fail to reveal key assumptions, causes, effects, or patterns.

Disadvantage #2Bar graphs can be easily manipulated to yield false impressions and not very good for a large number of categories. Especially comparing two or more variables, especially if one is not consistently bigger than the other.

QuestionIf you pick two students from

the class, what is the probability that their birthday is in Spring*?

(*Spring is months March, April, and May)

Solve it!6/28* 5/27

30/756=5/126

Sites Used www.abs.gov.au/websitedbs/�

CaSHome.nsf/Home/CaSQ+3A+WHAT'S+THE+DIFFERENCE+BETWEEN+NUMERICAL+AND+CATEGORICAL+DATA

http://www.cdc.gov/nchs/about/50th_anniversary.htm

http://cstl.syr.edu/fipse/tabbar/revbar/revbar.htm