Scatter plots: patterns of association

Answer Key - Grade 8 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. Read this first

   Table, minutes of practice a day | songs learned in a month

   10 | 2, 20 | 3, 30 | 5, 40 | 6. On the scatter plot, the minutes of practice go across (x) and the songs learned go up (y).

2. 1.

   Bo kept a table of daily piano practice and songs learned each month. A cat napped on the keys once. Where does the dot for the 30-minute row go, written as (x, y)?

   (30, 5)

3. Table, days since planting | height in centimeters

   4 | 3, 8 | 7, 12 | 10, 16 | 14. On the scatter plot, the days since planting go across (x) and the heights go up (y).

4. 2.

   Esme measured a bean plant every few days and filled in a table. The plant now has its own name tag. Where does the dot for day 12 go, written as (x, y)?

   (12, 10)

5. 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).

6. 3.

   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)?

   (11, 26)
7. 4.

   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 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.
   • A negative association: as the ride length goes up, the ride time tends to go down.
8. 5.

   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.
9. 6.

   Noah dropped a play ball from different heights and measured each bounce. A ruler line is drawn through the middle of the dots. Which sentence describes the association?

   • A negative association: as the drop height goes up, the bounce height tends to go down.
   • No association: as the drop height goes up, the bounce height tends neither to go up nor to go down.
   • A positive association: as the drop height goes up, the bounce height tends to go up.
10. 7.

    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?

    • No association: as the dog's weight goes up, the number of tricks tends neither to go up nor to go down.
    • A positive association: as the dog's weight goes up, the number of tricks tends to go up.
    • A negative association: as the dog's weight goes up, the number of tricks tends to go down.
11. 8.

    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)?

    (35, 12)
12. 9.

    At field day, Esme checked the lemonade left in the cooler every ten minutes. Near the end, a helper mixed a fresh batch. Which point is the outlier, written as (x, y)?

    (80, 29)
13. 10.

    Jun rode eight bike routes and timed each one. One route was downhill with the wind behind it. Which point is the outlier, written as (x, y)?

    (12, 28)