Scatter plots: patterns of association
Grade 8 Math Worksheet
Circle the best answer, or write your answer on the line.
Read this first
Table, quiz score | minutes studied
72 | 20, 80 | 35, 88 | 45, 91 | 60. On the scatter plot, the minutes studied go across (x) and the quiz scores go up (y).
Luz's table lists each student's quiz score first, then the minutes studied. Where does the dot for the student who studied 45 minutes go, written as (x, y)?
Table, height in centimeters | days since planting
18 | 10, 45 | 20, 80 | 30, 120 | 40. On the scatter plot, the days since planting go across (x) and the heights go up (y).
Milo wrote a sunflower's height first, then the days since planting, in each row of a table. Where does the dot for day 30 go, written as (x, y)?
Table, jump distance in centimeters | run-up steps
150 | 3, 175 | 5, 190 | 7, 205 | 9. On the scatter plot, the run-up steps go across (x) and the jump distances go up (y).
Noah's table gives each long-jump distance first, then the number of run-up steps. Where does the dot for the 7-step jump go, written as (x, y)?
Kira recorded the heights of eight classmates and their spelling scores. Which sentence describes the association?
- No association: as the height goes up, the spelling score tends neither to go up nor to go down.
- A positive association: as the height goes up, the spelling score tends to go up.
- A negative association: as the height goes up, the spelling score tends to go down.
On eight days, Bo noted the noon temperature and the number of books checked out from the class library. Which sentence describes the association?
- A positive association: as the noon temperature goes up, the number of books checked out tends to go up.
- No association: as the noon temperature goes up, the number of books checked out tends neither to go up nor to go down.
- A negative association: as the noon temperature goes up, the number of books checked out tends to go down.
On a long field trip, Ren checked the miles driven and the gas left in the bus at each stop. Which sentence describes the pattern of the dots?
- No association: the dots tend to show no clear pattern.
- A nonlinear association: the dots tend to follow a curve, not one straight line.
- A linear association: the dots tend to stay near one straight ruler line.
Tala plotted hours of practice a week against free throws made for eight players. Which point is the outlier, written as (x, y)?
After the lunch bell, Ari counted the kids still on the playground each minute. At one count, another class came out early. Which point is the outlier, written as (x, y)?
Milo's baking club recorded the grams of flour and the number of cookies in each batch. One batch was giant cookies. Which point is the outlier, written as (x, y)?
Kira timed third graders and eighth graders running 400 meters and measured their heights. The dots form two clusters. How many runners are in the cluster of taller runners?