Instruction 13 -Referring to Instruction 13

question 163

Multiple Choice

Instruction 13.41
An automotive engineer would like to be able to predict automobile fuel economy. She believes that the two most important characteristics that affect economy are engine power and the number of cylinders (4 or 6) of a car. She believes that the appropriate model is
$\begin{array}{l}Y = 40 - 0.05 X _ { 1 } + 20 X _ { 2 } - 0.1 X _ { 1 } X _ { 2 }\\\\\text { where } \begin{aligned}X _ { 1 } & = \text { engine power } \\X _ { 2 } & = 1 \text { if } 4 \text { cylinders, } 0 \text { if } 6 \text { cylinders } \\Y & = \text { economy expressed as kilometres. }\end{aligned}\end{array}$
-Referring to Instruction 13.41,the fitted model for predicting economy for 4-cylinder cars is ______.

• A)60 - 0.15X₁
• B)40 - 0.10X₁
• C)40 - 0.05X₁
• D)60 - 0.10X₁

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Definitions:

Composite Volcano

A common type of volcano constructed of alternating layers of lava, pyroclastic deposits, and mass-wasting deposits, including mudflows; synonym: stratovolcano.

Pyroclastic Deposits

Accumulations of volcanic material ejected during an eruption, including ash, bombs, and blocks.

Composite Volcano

A volcano built by both lava flows and pyroclastic eruptions, typically featuring steep profiles and explosive activity.

Shield Volcano

A broad, domed volcano with gently sloping sides, primarily formed by the eruption of low-viscosity lava.