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Bar Graphs

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Bar Graph or Double Bar Graph (REVIEW) A bar graph uses length of bars to represent numbers and COMPARE data. In some cases, the use of a pair of bars to compare data is more useful. This kind of graph is called a double bar graph. MathisFun.Com- Organizing and Comparing Data; Math on Call p. 262-313

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How do you make a bar graph? 1.Create a title 2.Draw an x and y axis (LABEL what each one represents!) 3.Plot the information given onto the graph Example: Last week’s temperatures in degrees Fahrenheit were: Monday- 45 Tuesday- 60 Wednesday- 48 Thursday- 55 Friday- 56 Saturday- 68 Sunday- 70 Let’s make that into a bar graph.

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It should look like this: day of the week degrees (Fahrenheit)

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Double Bar Graphs

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How do you make a double bar graph? A double bar graph is used to compare two things at once using the same graph. To create a double bar graph you have to… 1.Create a title 2.Draw an x and y axis (LABEL what each one represents!) 3.Make a key to represent what each of the different bars stand for 4.Plot the information given onto the graph Last week’s temperatures in degrees Fahrenheit were: Monday- 45 Tuesday- 60 Wednesday- 48 Thursday- 55 Friday- 56 Saturday- 68 Sunday- 70 Last week’s temperature in degrees Celsius were Monday- 7 Tuesday- 16 Wednesday- 9 Thursday- 12 Friday- 13 Saturday- 20 Sunday- 21

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It should look like this: day of the week temperature (in degrees) Based on the graph answer these questions: 1.Which day of the week was the hottest in degrees Fahrenheit? 2.Which day of the week was the coldest in degrees Celsius?

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Histograms

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Histogram (REVIEW) Histograms show how often data falls into different ranges or intervals. MathisFun.Com- Organizing and Comparing Data; Math on Call p. 262-313

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How do you make a histogram? Histograms are VERY similar to bar graphs and double bar graphs but: There are NO gaps between the bars in a histogram. The x axis is measured in intervals or ranges. 1.Make a title 2.Draw an x and y axis (LABEL what each one represents!) 3.Make sure your x axis is in intervals 4.Plot the information given onto the graph

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EXAMPLE: You asked customers who bought one of the blue dresses how old they were. The ages were from 5 to 25 years old. You decide to put the results into groups of 5. Then you put the data you collected onto a histogram. ages number of dresses Blue Dress Poll

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