A Collection of Paired Data Consists of the Number of Years

question 42

Multiple Choice

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
$\text { Score }=31.55+10.90 \text { Years. }$
$\begin{array}{lclcc}\text { Predictor } & \text { Coef } & \text { StDev } & \text { T } & \text { P } \\\text { Constant } & 31.55 & 6.360 & 4.96 & 0.000 \\\text { Years } & 10.90 & 1.744 & 6.25 & 0.000\end{array}$
$$\mathrm{S}=5.651 \quad \mathrm{R}-\mathrm{Sq}=83.0 \% \quad \mathrm{R}-\mathrm{Sq}(\text { Adj }) =82.7 \%$$
Predicted values
$\begin{array}{llcc}\text { Fit } & \text { StDev Fit } & 95.0 \% \text { CI } & 95.0 \% \text { PI } \\ 53.35 & 3.168 & (42.72,63.98) & (31.61,75.09) \end{array}$
Use the information in the display to find the value of the linear correlation coefficient r. Determine whether the significant linear correlation between years of study and test scores. Use a significance level of $0.05$ . There are 16 data.

• A) \(r = 0.91\); There is significant linear correlation.
• B) \(\mathrm { r } = 0.83\); There is no significant linear correlation.
• C) \(\mathrm { r } = 0.91\); There is no significant linear correlation
• D) \(r = 0.83\); There is significant linear correlation.

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The ability of a living system to maintain a stable internal environment despite changes in external conditions.

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The network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating its actions and sensory information.

Stable Environment

An environment where conditions remain relatively constant over time, allowing for the maintenance of ecosystem equilibrium.