Construct a correlational study that contains two interval or ratio variables that you believe have a curvilinear relationship. Draw a hypothetical scatterplot of the relationship (with clearly labeled axes), and then, show how the data might look if you have a restriction-of-range problem that gives you a strong, negative correlation coefficient. Explain how restriction of range is problematic in your example.
What will be an ideal response?
Ans: Answers will vary but will include a U-shaped or inverted U-shaped scatterplot in the first drawing and a portion of the data in the second drawing that represent the portion of the range that contributes to a negative relationship.
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