Unit 3, Lesson 7
The Correlation Coefficient
Algebra 1
7.1
Warm-up
Which three go together? Why do they go together?
AGraph of a scatter plot, origin O. Horizontal axis, distance (miles), scale 0 to 10, by 2’s. Vertical axis, cost (dollars), scale 0 to 22, by 2’s. The data has a visible pattern rising from near (point 5 comma 4) to (9 point 5 comma 21).
BGraph of a scatter plot, origin O, with grid. Horizontal axis, height (millimeters), scale 0 to 10, by 2’s. Vertical axis, weight (milligrams), scale 0 to 22, by 2’s. The data has no visible pattern.
CScatterplot, origin O. Horizontal, from 0 to 10, by 2’s, labeled precipitation, centimeters. Vertical, from 0 to 22, by 2’s, labeled water used for irrigation, thousands of gallons. 25 points represent the data, trend linearly downward and to the right. First data point approximately begins at 0 comma 10 and last is approximately at 7 comma 3 point 5.
DScatterplot, origin O. Horizontal, from 0 to 10, by 2’s, labeled temperature, degrees Celsius. Vertical, from 0 to 22, by 2’s, labeled number of phytoplankton, tens of thousands. 25 points that represent the data, trend slightly upward and to the right first and then very steep upward curve and to the right. First data point approximately begins at 0 comma 2 point 5 and last is approximately at 9 point 5 comma 21.