Oil Quality and Price

question 262

Essay

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. A partial Minitab output follows: Descriptive Statistics Variable N Mean StDev SE Mean Degrees 13 34.60 4.613 1.280 Price 13 12.730 0.457 0.127 Covariances Degrees Price Degrees 21.281667 Price 2.026750 0.208833 Regression Analysis Predictor Coef StDev T P Constant 9.4349 0.2867 32.91 0.000 Degrees 0.095235 0.008220 11.59 0.000 S = 0.1314 R−Sq = 92.46% R−Sq(adj)= 91.7% Analysis of Variance Source DF SS MS F P Regression 1 2.3162 2.3162 134.24 0.000 Residual Error 11 0.1898 0.0173 Total 12 2.5060
-{Oil Quality and Price Narrative} Plot the residuals against the predicted values .

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Definitions:

Old Northwest

Refers to the region of the United States northwest of the Ohio River, which was acquired through the Treaty of Paris in 1783 and organized under the Northwest Ordinance of 1787.

Interchangeable Parts

Interchangeable parts are components that are made to specifications that ensure they are so nearly identical that they will fit into any assembly of the same type, reducing manufacturing complexity and allowing for easier repair of mechanical systems.

Labor Surplus

A situation in which the supply of workers exceeds the demand for their services, often leading to unemployment and lower wages.

Economic Depression

A long-term downturn in economic activity characterized by high unemployment, low consumer spending, and business failures.