Scatter Graphs & Correlation Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. On a scatter graph, points should be plotted as:
- A. Large dots
- B. Small crosses (×)
- C. Circles
- D. Squares
2. A scatter graph shows that as temperature increases, ice cream sales increase. What type of correlation is this?
- A. Negative correlation
- B. Zero correlation
- C. Positive correlation
- D. No correlation
3. A scatter graph shows that as a car's age increases, its value decreases. What type of correlation is this?
- A. Positive correlation
- B. Negative correlation
- C. Zero correlation
- D. Perfect correlation
4. Which of these is a correct rule for drawing a line of best fit?
- A. It must pass through the origin
- B. It should be a smooth curve following every point exactly
- C. It should be a single straight line with points roughly evenly spread either side
- D. It should only cover the first half of the data
5. A student uses a line of best fit to predict a value far beyond the range of the plotted data. Why might this prediction be unreliable?
- A. Because it is interpolation, which is always inaccurate
- B. Because it is extrapolation, and the trend may not continue beyond the observed data
- C. Because scatter graphs cannot be used for predictions
- D. Because the line of best fit must always pass through zero