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# MAFS.8.SP.1.3

Use the equation of a linear model to solve problems in the context of bivariate measurement data, interpreting the slope and intercept. For example, in a linear model for a biology experiment, interpret a slope of 1.5 cm/hr as meaning that an additional hour of sunlight each day is associated with an additional 1.5 cm in mature plant height.
Subject Area: Mathematics
Domain-Subdomain: Statistics & Probability
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Investigate patterns of association in bivariate data. (Supporting Cluster) -

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Date of Last Rating: 02/14
Status: State Board Approved
Assessed: Yes

### TEST ITEM SPECIFICATIONS

• Item Type(s): This benchmark may be assessed using: MS , OR item(s)

• Assessment Limits :

Numbers in items must be simple rational numbers (e.g., , to the 10th). Data are required for all items. In all items requiring a line of best fit, the equation of that line should be given.

• Calculator :

Neutral

• Context :

Required

### SAMPLE TEST ITEMS (2)

• Test Item #: Sample Item 1
• Question:

The slope of the line of best fit for the data shown is approximately 1.5.

What is the meaning of 1.5 in terms of the context?

• Difficulty: N/A
• Type: MS: Multiselect

• Test Item #: Sample Item 2
• Question:

The amount of money Alan earns as a plumber after x hours is modeled by the equation y = \$25x + \$50.

What is the meaning of \$25 in this model?

• Difficulty: N/A
• Type: OR: Open Response