1. 4.1 Coordinates and scatter plots

2. Coordinate Basics Characteristics of plane.
Coordinate plane: intersection of horizontal (x axis) and vertical line (y axis).
Characteristics of plane.
X-axis: horizontal line
Y-axis: vertical line
Origin: (0, 0)
Ordered pairs (x, y)
Quadrants: 4

3. Plotting Points Steps: Plot following points: (2, -3), (0, 2), (-2,-5)
Start at origin
Move left(-)/right(+) based on x-coord.
Move up(+)/down(-) based on y-coord.
Plot point
Plot following points:
(2, -3), (0, 2), (-2,-5)

4. Student Examples Plot the following points A(-3, 4) B(2, 5) C(-2, -4)

5. Finding Points Steps: Find x-coordinate Find y-coordinate
Write ordered pairs
Give coordinates of point A, B, C.

6. Student Examples
List the given coordinates. A: B: C: D: E: F:

7. Definitions
Scatter Plot: Shows relationship between two data sets.

8. Types of Scatterplots

9. Interpret Data

11. Create a scatterplot and describe the relation - T
The table shows some measurements in inches and the corresponding measurement in centimeters. Make a scatterplot of the data. Let the ordered prs. Have the form (i,c) I 1 5 10 15 20 C
2.54
12.7
25.4
38.1
50.8

12. Create a scatterplot and describe the relation - S
The table shows various quiz grades and how many students received each grade. Make a scatter plot of the data. Use the horizontal axis to represent the grades.
Grade 1 2 3 4 5 6 7 8
# stud 12

13. Wrap up
Questions/Comments
Hw: Text pg. 206, #’s: 2-32 evens