Grade 9 Math (MTH1W) · Data

Correlation from a scatter plot

Classify the correlation shown by a set of paired data as strong positive, strong negative, or no correlation. Unlimited questions, five difficulty levels, and a full worked solution every time, included free with weekly lessons.

Practice this skill Curriculum: MTH1W-D2.2, MTH1W-D2.3

Try one

A study recorded minutes of screen time (x) and quiz score (%) (y) for 5 subjects: (1, 21), (2, 26), (3, 30), (4, 36), (5, 39). What kind of correlation does this scatter plot show?

  • strong positive correlation
  • no correlation
  • weak positive correlation
  • strong negative correlation

Answer: strong positive correlation

See one solved, step by step

A study recorded minutes of screen time (x) and quiz score (%) (y) for 6 subjects: (1, 15), (2, 13), (3, 11), (4, 10), (5, 6), (6, 7). What kind of correlation does this scatter plot show?

  • weak negative correlation
  • strong positive correlation
  • weak positive correlation
  • strong negative correlation
📘 Worked solution
1As x increases, y tends to decrease.Correlation direction compares how y changes as x grows.
2The points stay close to a straight−line trend.Correlation strength describes how tightly the points cluster around that trend.
3This is a strong negative correlation.Combine the direction and strength to classify the correlation.

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