4.1 Coordinates and scatter plots

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

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)

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

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

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

Definitions Scatter Plot: Shows relationship between two data sets.

Types of Scatterplots

Interpret Data

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

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

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