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Scatter graphs and correlation

8th grade (Year 9 in England) · 16 questions · Common Core: 8.SP.A.1, 8.SP.A.2, 8.SP.A.3 · England: KS3 Statistics, GCSE Foundation Statistics

Name

Date

Score/ 16

  1. Question 1

    Elena plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 10)(2, 9)(3, 8)(4, 7)(5, 6)(6, 5)(7, 5)(8, 3)
    • A. Positive
    • B. Negative
    • C. No correlation

  2. Question 2

    The line of best fit for hours studied (x) and test score (y) is y = 2x + 1. Predict the score for 8 hours of study.

    xy246810121481624324048566472800y = 2x + 1

    Answer

  3. Question 3

    Omar plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 10)(2, 8)(3, 7)(4, 6)(5, 5)(6, 4)(7, 4)(8, 3)
    • A. Positive
    • B. Negative
    • C. No correlation

  4. Question 4

    The line of best fit for hours studied (x) and test score (y) is y = 5x + 1. Predict the score for 5 hours of study.

    xy246810121481624324048566472800y = 5x + 1

    Answer

  5. Question 5

    Chloe plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 9)(2, 9)(3, 8)(4, 8)(5, 5)(6, 6)(7, 5)(8, 4)
    • A. Positive
    • B. Negative
    • C. No correlation

  6. Question 6

    The line of best fit for hours studied (x) and test score (y) is y = 2x + 5. Predict the score for 11 hours of study.

    xy246810121481624324048566472800y = 2x + 5

    Answer

  7. Question 7

    Kwame plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 10)(2, 9)(3, 9)(4, 7)(5, 6)(6, 6)(7, 5)(8, 2)
    • A. Positive
    • B. Negative
    • C. No correlation

  8. Question 8

    The line of best fit for hours studied (x) and test score (y) is y = 3x + 4. Predict the score for 4 hours of study.

    xy246810121481624324048566472800y = 3x + 4

    Answer

  9. Question 9

    Ben plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 3)(2, 5)(3, 5)(4, 7)(5, 7)(6, 8)(7, 10)(8, 10)
    • A. Positive
    • B. Negative
    • C. No correlation

  10. Question 10

    The line of best fit for hours studied (x) and test score (y) is y = 3x + 7. Predict the score for 8 hours of study.

    xy246810121481624324048566472800y = 3x + 7

    Answer

  11. Question 11

    Zara plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 4)(2, 5)(3, 4)(4, 6)(5, 8)(6, 7)(7, 8)(8, 9)
    • A. Positive
    • B. Negative
    • C. No correlation

  12. Question 12

    The line of best fit for hours studied (x) and test score (y) is y = 2x + 1. Predict the score for 10 hours of study.

    xy246810121481624324048566472800y = 2x + 1

    Answer

  13. Question 13

    Maya plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 10)(2, 8)(3, 8)(4, 6)(5, 6)(6, 6)(7, 5)(8, 3)
    • A. Positive
    • B. Negative
    • C. No correlation

  14. Question 14

    The line of best fit for hours studied (x) and test score (y) is y = 3x + 9. Predict the score for 8 hours of study.

    xy246810121481624324048566472800y = 3x + 9

    Answer

  15. Question 15

    Hiro plotted two measurements for 8 plants in a scatter graph. What type of correlation does it show?

    xy24681024681012140(1, 4)(2, 4)(3, 4)(4, 5)(5, 6)(6, 9)(7, 10)(8, 11)
    • A. Positive
    • B. Negative
    • C. No correlation

  16. Question 16

    The line of best fit for hours studied (x) and test score (y) is y = 2x + 2. Predict the score for 11 hours of study.

    xy246810121481624324048566472800y = 2x + 2

    Answer

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Answer key: Scatter graphs and correlation

  1. 1. B. Negative

  2. 2. 17

  3. 3. B. Negative

  4. 4. 26

  5. 5. B. Negative

  6. 6. 27

  7. 7. B. Negative

  8. 8. 16

  9. 9. A. Positive

  10. 10. 31

  11. 11. A. Positive

  12. 12. 21

  13. 13. B. Negative

  14. 14. 33

  15. 15. A. Positive

  16. 16. 24