Use the Computer Display to Answer the Question $\text { Score }=31.55+10.90 \text { Years. }$

question 126

Multiple Choice

Use the computer display to answer the question.
-A collection of paired data consists of the number of years that students have studied Spanish and their scores on a Spanish language proficiency test. A computer program was used to obtain the least squares linear
Regression line and the computer output is shown below. Along with the paired sample data, the program was
Also given an x value of 2 (years of study) to be used for predicting test score.
The regression equation is $\text { Score }=31.55+10.90 \text { Years. }$

$\begin{array}{lcccc}\text { Predictor } & \text { Coef } & \text { StDev } & \mathrm{T} & \mathrm{P} \\\text { Constant } & 31.55 & 6.360 & 4.96 & 0.000 \\\text { Years } & 10.90 & 1.744 & 6.25 & 0.000\end{array}$

$\mathrm{S}=5.651 \quad \mathrm{R}-\mathrm{Sq}=83.0 \% \quad \mathrm{R}-\mathrm{Sq}(\mathrm{Adj}) =82.7 \%$

$\text { Predicted values }$

$\begin{array}{lccc}\text { Fit } & \text { StDev Fit } & 95.0 \% \text { CI } & 95.0 \% \text { PI } \\53.35 & 3.168 & (42.72,63.98) & (31.61,75.09) \\\hline\end{array}$
What percentage of the total variation in test scores can be explained by the linear relationship between years of
Study and test scores?

• A) 82.7%
• B) 91.1%
• C) 17.0%
• D) 83.0%

---

Definitions:

Organic Molecule

A compound containing carbon atoms bonded to hydrogen atoms and often other elements, fundamental to the chemistry of life.

Vitamin

Organic compounds required in small amounts for essential bodily functions and must be obtained through the diet as the body cannot produce them sufficiently.

Water Molecule

A molecule consisting of two hydrogen atoms and one oxygen atom, forming the basis of all known forms of life and many solvents.

Polar Covalent Bond

Covalent bond in which atoms do not share their electrons equally.