AP Statistics 5.1: Describing Scatterplots

The scatterplot reveals a strong, positive, roughly linear association between the mass and length of bullfrogs. There are no points that seriously deviate from the straight-line pattern of the points in the plot.

Essentially correct (E) if the response provides
a description that includes at least three of
components 1-4 and component 5:
1. Direction of association (positive or
increasing)
3. Form of association (linear or approximately
linear)
4. Unusual features (no points with large
discrepancies from the pattern (straight line) exhibited by most of the points on the plot)
5. Context (association between length and mass of bullfrogs)
Partially correct (P) if the response satisfies only one or two components out of components 1-4 and component 5
OR
if the response satisfies at least three out of
components 1-4 but does not satisfy
component 5.
Incorrect (I) if the response does not meet the
criteria for E or P.

Additional Notes:

- To satisfy component 4, it is sufficient to simply indicate that there are no unusual features.

- To satisfy component 5, it is minimally sufficient for the response to refer to the association or relationship between mass and length without explicitly mentioning bullfrogs.

- The strength of the response in part (a) may be considered if holistic scoring is needed.

Model Solution

Scoring