Oil Quality and Price
Quality of Oil Is Measured in API

question 4

True/False

Oil Quality and Price
Quality of oil is measured in API gravity degrees--the higher the degrees API,the higher the quality.The table shown below is produced by an expert in the field who believes that there is a relationship between quality and price per barrel.
$$\begin{array} { | c | c | } \hline \text { Oi degrees API } & \text { Price per barrel (in \$) } \\\hline 27.0 & 12.02 \\28.5 & 12.04 \\30.8 & 12.32 \\31.3 & 12.27 \\31.9 & 12.49 \\34.5 & 12.70 \\34.0 & 12.80 \\34.7 & 13.00 \\37.0 & 13.00 \\41.0 & 13.17 \\41.0 & 13.19 \\38.8 & 13.22 \\39.3 & 13.27 \\\hline\end{array}$$ A partial Minitab output follows:
$$\begin{array}{l}\text { Dascriptive atafistics }\\\begin{array} { l l l l l } \text { Variable } & \mathrm { N } & \text { Mear } & \text { StDev } & \text { SE Mear } \\\text { Degrees } & 13 & 34.60 & 4.613 & 1.280 \\\text { Price } & 13 & 1270 & 0.757 & 0.127\end{array}\end{array}$$ $$\begin{array}{l}\begin{array} { l l } \text { Covariances }&&\\&\text { Degeres } & \text { Price } \\\text { Degeres } &21.281667 & \\\text { Price } &2.026750 & 0.208933\end{array}\end{array}$$ $$\begin{array}{l}\text { Analysis of Variance }\\\begin{array} { l l r r r } \text { Source } & \text { DF } & \text { SS } & \text { MS } & \text { F } & \text {p}\\\text { Regeression } & 1 & 2.3162 & 2.3162 & 134.24&0.000 \\\text { Resichul Entar } & 11 & 0.1898 & 0.0173 & \\\text { Total } & 12 & 2.5060 & &\end{array}\end{array}$$
-In a simple linear regression problem,the least squares line is $\hat { y } = - 3.75 + 1.25 x$ ,and the coefficient of determination is 0.81.The coefficient of correlation must be -0.90.

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Definitions:

Peroxisomes

Small organelles found in almost all eukaryotic cells that contain enzymes for breaking down fatty acids and other metabolic tasks.

Detoxify

The process of removing toxic substances or qualities, often referring to the liver's role in cleaning blood or to treatments for drug dependence.

Interstitial Fluid

Interstitial fluid is the fluid that surrounds cells within tissues, facilitating the exchange of nutrients, waste products, and other molecules between blood and cells.

Cardiac Muscle Fiber

Specialized muscle fibers found in the heart, characterized by their striations, intercalated discs, and ability to contract rhythmically.