Sample Test Item Preview

General Information
Related Benchmark: MAFS.912.S-ID.2.6
Reporting Category: Statistics & Probability: Interpreting Categorical & Quantitative Data
Type: OR: Open Response
Difficulty: N/A

A company creates the equation y = 11.26x-76.1 to model the relationship between the number of pages in its catalog and the number of orders, in thousands, that were received. 

To determine how well the equation models the relationship, the company plots the residuals as shown.

Why is the equation not a good model for the relationship?

Type your answer in the space provided.

Possible Answer:

Because the points on the residual plot have a linear pattern.