Use scatter plots to represent two quantitative variables and fit functions to model relationships.
Choose the most reasonable model type from a scatter plot or scatter-plot description
Problem
What model type is most reasonable for scatter-plot data described this way: points cluster around a straight decreasing band?
Big Picture
What this problem is really about
Model family comes from the shape of the point cloud, while increasing or decreasing only tells direction. A straight band supports a line, changing steepness suggests exponential behavior, and a turning point suggests a quadratic; use the simplest family supported by those features.
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