Direction of Association: Positive, Negative, or None
This Grade 8 math skill from Pengi Math (Grade 8) teaches students to determine the direction of association in a scatter plot—positive, negative, or none. Students analyze whether y-values tend to increase, decrease, or show no pattern as x-values increase, and connect this to real-world bivariate data.
Key Concepts
When analyzing scatter plots, it is important to describe the general relationship between two variables.
Positive Association : As $x$ values increase, $y$ values tend to increase (upward trend).
Common Questions
What is a positive association in a scatter plot?
A positive association means that as x increases, y also tends to increase. The data points slope upward from left to right.
What is a negative association in a scatter plot?
A negative association means that as x increases, y tends to decrease. The data points slope downward from left to right.
What does no association mean in a scatter plot?
No association means there is no clear pattern—the data points are scattered randomly with no consistent upward or downward trend.
How do you identify the direction of association from a scatter plot?
Look at the overall trend of the data: if it goes up from left to right, the association is positive; if it goes down, it is negative; if there is no pattern, there is no association.
Where is direction of association taught in Grade 8?
Direction of association (positive, negative, or none) is covered in the Grade 8 Pengi Math textbook under scatter plots and statistics.