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How Do You Plot Points?

Unit 8 Statistics Day 1 Graphing Data on the Coordinate Plane and Characteristics of Scatter Plots. How Do You Plot Points?. Before plotting points on a graph, you first have to understand the X and Y axis.

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How Do You Plot Points?

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  1. Unit 8 Statistics Day 1 Graphing Data on the Coordinate Plane and Characteristics of Scatter Plots

  2. How Do You Plot Points? • Before plotting points on a graph, you first have to understand the X and Y axis. • The X and Y axis are number lines that run horizontally and vertically on the coordinate system. • An example of a set of coordinates for a point is (5,2), which is marked with the blue dot in the coordinate system on the right. • To graph a point you always start at the origin (0,0).

  3. The X Axis • The X axis is the horizontal number line of the graph. • The X axis is numbered with positive coordinates on the right and negative coordinates on the left with zero in the middle.

  4. The Y Axis • The Y axis is the vertical number line on the graph. • The Y axis is numbered with positive coordinates on the top and negative coordinates on the bottom of the X axis.

  5. Plotting The Point • How do you find the point (2,3) within the coordinate system. • The first number (in this case 2) is the X coordinate. • The second number (in this case 3) is the Y coordinate. • This point would be 2 over on the X axis and 3 up on the Y axis. • The point (2,3) is labeled with a green dot in the coordinate system.

  6. Now we are going to plot some points… • You will need a marker from the front of the room. • Listen for the timer. • When you return to your seat, get out a piece of paper for notes. This is day one notes for this unit. • Around the room are 6 different graph papers. • You will go to each paper and graph the required data. • You will do this in an organized and quiet manner.

  7. 4 Quadrants • The X and Y axis together form 4 different quadrants. • The first quadrant is labeled with roman numeral I. A point in the 1st quadrant has both positive X and Y coordinates. • The second quadrant is labeled with roman numeral II. A point in the 2nd quadrant has a negative X coordinate and a positive Y coordinate. • The third quadrant is labeled with roman numeral III. A point in the 3rd quadrant has both negative X and Y coordinates. • The fourth quadrant is labeled with roman numeral IV. A point in the 4th quadrant has a positive X coordinate and a negative Y coordinates. • The green dot is the origin. The origin is where the X axis and the Y axis cross. The coordinates of the origin are (0,0) II I III IV

  8. Scatter Plots • Definition • A graph that relates two groups of data. • 3 Types of Correlation of Scatter Plots • Correlation means what relationship the two sets of data have to each other. • Positive • Negative • No

  9. Do all three graphs show the same type of growth? What kind of growth is shown by each No Correlation Negative Correlation Positive Correlation

  10. How about you try a few on your own… Pg. 62 2-22, 30-34 evens only

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