Graphing Data. 3 Types of Graphs Bar Graph Line Graph Circle (or Pie) Graph

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Graphing Data Slide 2 3 Types of Graphs Bar Graph Line Graph Circle (or Pie) Graph Slide 3 Bar Graph Useful for graphing items with different categories Slide 4 Bar Graph I can change the order. Slide 5 Bar Graph Does this change the information? Slide 6 Bar Graph Whatever helps me get the point across Slide 7 Circle Graph Ideal for showing percentages (fractions) All the parts add up to a whole Slide 8 To find the percentage Divide the number in whichever category by the total number. 10 students are too hot 12 students are too cold 2 students arent sure 1 Teacher thinks it is just right The total is 25 Slide 9 To find the percentage 10/25 = 40% are too hot 12/25 = 48% are too cold 2/25 = 8% arent sure 1/25 = 4% is just right When making the graph: 1 circle is 360 = 100% Each percent is 3.6 Slide 10 Line graph A line graph is useful when a dependent variable changes due to a relationship with an independent variable. The independent variable is x The dependent variable is y Slide 11 Line graph Well start with an experiment. Slide 12 Line graph As we turn the knob, we will take data. The knob location will be x, and the gauge reading will be y. x= and y=0 x=1 and y=1 x=2 and y=3 and so on Slide 13 Lets look at our data Lets make a table with our data. It may be helpful to sort the data by the independent variable. XY 0 11 23 0 -3 XY -3 0 0 11 23 Slide 14 Lets look at our solutions Now lets plot the solutions on a graph. XY -3 0 0 11 23 Slide 15 Tow the line! It is reasonable to use the line as the solution rather than just the points. Interpolation Extrapolation Slide 16 If it doesnt fit Usually, real data doesnt fit on a perfect line. DO NOT play connect the dots. Make a regression line, or best fit line. WRONG Slide 17 If it doesnt fit Usually, real data doesnt fit on a perfect line. DO NOT play connect the dots. Make a regression line, or best fit line. Eyeball it Use Excel Slide 18 It doesnt look square! We wont always have a straight line on a graph. This is a parabola. It is common in science graphs. Slide 19 It doesnt look like anything! Often, we can write an equation for a graph. Sometimes we cant. Thats okay. Slide 20 Assignment p. 26, 1-5 Worksheet Chapter 1 Test Friday 8/27 Bring Index Cards tomorrow 4.1 NOTES - Graphing Basic Parabolas ... 4.1 NOTES ¢­ Graphing Basic Parabolas BELLWORK: Graph the function
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