1 In the Interactions Area, create a scatter plot for the Animals Starter File, using "pounds" as the xs and "weeks" as the ys.
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Form: Does the point cloud appear linear or nonlinear?
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Direction: If it’s linear, does it appear to go up or down as you move from left to right?
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Strength: Is the point cloud tightly packed, or loosely dispersed?
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Would you predict that the r-value is positive or negative?
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Will it be closer to zero, closer to ±1, or in between?
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What r-value, does Pyret compute when you type
r-value(animals-table, "pounds", "weeks")? -
Does this match your predictions?
2 In the Interactions Area, create a scatter plot for the Animals Dataset, using "age" as the xs and "weeks" as the ys.
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Form: Does the point cloud appear linear or nonlinear?
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Direction: If it’s linear, does it appear to go up or down as you move from left to right?
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Strength: Is the point cloud tightly packed, or loosely dispersed?
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Would you predict that the r-value is positive or negative?
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Will it be closer to zero, closer to ±1, or in between?
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What r-value does Pyret compute?
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Does this match your prediction?
3 Is this correlation stronger or weaker than the correlation for "pounds"?
4 What does that mean?
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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