1 In the Interactions Area, create a scatter plot for the Animals Dataset, using "pounds" as the xs and "weeks" as the ys.

  • Form: Does the point cloud appear linear or non-linear?

  • Direction: If it’s linear, does it appear to go up or down as you move from left to right?

  • Strength: Is the point cloud tightly packed, or loosely dispersed?

  • Would you predict that the r-value is positive or negative?

  • Will it be closer to zero, closer to ±1, or in between?

  • 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.

  • Form: Does the point cloud appear linear or non-linear?

  • Direction: If it’s linear, does it appear to go up or down as you move from left to right?

  • Strength: Is the point cloud tightly packed, or loosely dispersed?

  • Would you predict that the r-value is positive or negative?

  • Will it be closer to zero, closer to ±1, or in between?

  • What r-value does Pyret compute?

  • Does this match your prediction?

3 Is this correlation stronger or weaker than the correlation for "pounds"?

  • What does that mean?

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