Scatter plots: patterns of association
Grade 8 Math Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
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Table, wind speed in mph | kite height in meters
5 | 12, 8 | 20, 11 | 26, 14 | 35. On the scatter plot, the wind speeds go across (x) and the kite heights go up (y).
Jun flew a kite on four windy days and made a table. One day the kite tried to visit a cloud. Where does the dot for the 11 mph day go, written as (x, y)?
Kira timed eight bike rides of different lengths and plotted them. A ruler line is drawn through the middle of the dots. Which sentence describes the association?
- A negative association: as the ride length goes up, the ride time tends to go down.
- A positive association: as the ride length goes up, the ride time tends to go up.
- No association: as the ride length goes up, the ride time tends neither to go up nor to go down.
Each evening at the outdoor ice rink, Luz noted the temperature and the cups of cocoa poured. A ruler line is drawn through the middle of the dots. Which sentence describes the association?
- A positive association: as the outside temperature goes up, the number of cups poured tends to go up.
- No association: as the outside temperature goes up, the number of cups poured tends neither to go up nor to go down.
- A negative association: as the outside temperature goes up, the number of cups poured tends to go down.
On a class trip up a mountain road, Milo read the temperature at each stop. A ruler line is drawn through the middle of the dots. Which sentence describes the association?
- A positive association: as the height goes up, the temperature tends to go up.
- No association: as the height goes up, the temperature tends neither to go up nor to go down.
- A negative association: as the height goes up, the temperature tends to go down.
Pia measured the shoe length and height of eight classmates. Nobody was allowed to stand on tiptoe. Which sentence describes the association?
- A positive association: as the shoe length goes up, the height tends to go up.
- No association: as the shoe length goes up, the height tends neither to go up nor to go down.
- A negative association: as the shoe length goes up, the height tends to go down.
During a long practice, Ren checked the water left in a bottle every ten minutes. The bottle got lighter and lighter. Which sentence describes the association?
- No association: as the practice time goes up, the amount of water left tends neither to go up nor to go down.
- A positive association: as the practice time goes up, the amount of water left tends to go up.
- A negative association: as the practice time goes up, the amount of water left tends to go down.
Tala asked eight classmates how long their bus ride to school takes and what they scored on a quiz. Which sentence describes the association?
- A negative association: as the bus ride time goes up, the quiz score tends to go down.
- No association: as the bus ride time goes up, the quiz score tends neither to go up nor to go down.
- A positive association: as the bus ride time goes up, the quiz score tends to go up.
At a dog-training class, Zee wrote down each dog's weight and how many tricks it knows. One small dog can take a bow. Which sentence describes the association?
- A positive association: as the dog's weight goes up, the number of tricks tends to go up.
- No association: as the dog's weight goes up, the number of tricks tends neither to go up nor to go down.
- A negative association: as the dog's weight goes up, the number of tricks tends to go down.
Ari logged reading time and pages read for eight days. On one day, a chatty parrot sat by the library window. Which point is the outlier, written as (x, y)?
Noah asked classmates how many blocks they live from school and how long the trip takes. The dots form two clusters. How many dots are in the cluster of kids who live farther away?