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: 
-{Oil Quality and Price Narrative} Interpret the value of the slope of the regression line.
Definitions:
Snow Line
The lowest altitude area on a mountain where snow remains throughout the year.
Region's Climate
The average weather patterns and conditions typically experienced in a specific geographic region over a long period.
Average Precipitation
The mean amount of rain, snow, or other forms of water falling to the ground in a given area over a specified period.
Average Temperature
A calculated central value of a set of temperatures over a specific period, giving an overall indication of climate.
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