Scatter graphs and correlation Quiz
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5 questions, one answer each
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1. As the number of hours of sleep rises, the number of yawns in class falls. What type of correlation is this?
- A. Positive correlation
- B. Negative correlation
- C. No correlation
- D. Causation
2. A line of best fit passes through (0, 5) and (10, 25). What is its gradient?
- A.
- B.
- C.
- D.
3. A scatter graph has points scattered with no pattern. A line of best fit for it would be:
- A. very reliable
- B. strongly positive
- C. strongly negative
- D. of little use for predictions
4. Data covers heights from 140 cm to 190 cm. Which prediction is an extrapolation?
- A. A person of 165 cm
- B. A person of 150 cm
- C. A person of 210 cm
- D. A person of 180 cm
5. Shoe size and test score show a weak positive correlation. Which conclusion is most sensible?
- A. Bigger feet cause higher scores.
- B. Shoe size and score are related, but this does not prove that one causes the other.
- C. Everyone with larger feet scores higher.
- D. There is no relationship at all.