A N I NTRO TO B AR G RAPHS By: Halee Kim, Alden Ford, Amy Yu, and Jen Zhang.

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Presentation transcript:

A N I NTRO TO B AR G RAPHS By: Halee Kim, Alden Ford, Amy Yu, and Jen Zhang

B AR G RAPH : WHAT IS IT ? A bar graph is a diagram in which the numerical values of variables are represented by the height or length of lines or rectangles of equal width. In other words, a bar graph is simply a chart with bars that have lengths proportional to numerical quantities. The bars can be horizontal or vertical. A bar graph is a way to organize categorical data. Necessary data to make a bar graph: independent and dependent variables and a single set of data.

USE A BAR GRAPH WHEN … Comparing the numbers of several different things at a specific point in time Showing C HANGES OVER TIME Combining groups and time periods together into a graph Tracking and comparing several items in accordance with two or more groups of people Graphing R ELATIVE FREQUENCY You should N OT use bar graphs if you’re comparing something to a larger whole, or to show proportion.

R EAL WORLD EXAMPLE OF A BAR GRAPH This graph is used in a real life situation when a new school is trying to decide what sport programs they should include in the fifth grade sports division. This data is able to be put in a bar graph because it is a single set of data from a sample and it makes it easy to analyze which sports are more favorable than others.

O UR REAL WORLD EXAMPLE ( CLASS SURVEY )

T HE BIG QUESTION Students in our class have taken a survey on what their top 5 candies are. The cafeteria wants to know the top 3 candies out of the 10 possible choices to put in the snack bar based on the survey. They have to spend $300. How much will they spend on Hershey Bars based on this graph? ANSWER: Hershey Bars: $94.12

A DVANTAGES OF A BAR GRAPH It immediately lets you see the data (top 5 favorite candies). It’s a great way of comparing data because the values of each category (candies) are easily seen side-by-side.

D ISADVANTAGES OF A BAR GRAPH The exact data in numbers may not be apparent or easily seen (because when it’s in bar graph form, the data looks slightly averaged) It is hard to express a linear equation with a bar graph.

S OURCES USED IN THIS PROJECT Slide 1 picture of a bar graph: Slide 2 (bar graph definition): i=ipEZUf_pL- 2J0QGU4YCIBg&ved=0CC8QkQ4&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm =bv ,d.dmQ&fp=d2e72972d76bf84c&biw=855&bih=479 i=ipEZUf_pL- 2J0QGU4YCIBg&ved=0CC8QkQ4&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm =bv ,d.dmQ&fp=d2e72972d76bf84c&biw=855&bih=479 Slide 3: used.html#page=0 (when to use bar graphs) used.html#page=0 Slide 4: (graph)