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} Predict with 95% confidence the oil price per barrel for an API degree of 35.
Definitions:
Spinalis Thoracis
A muscle in the back that is part of the erector spinae muscle group, helping to extend and stabilize the thoracic spine.
Longissimus Thoracis
A muscle in the back that helps extend, rotate, and laterally flex the spine.
Serratus Posterior Superior
A muscle situated in the upper back that helps in elevating the ribs during inhalation.
Elevate the Ribs
The action of increasing the thoracic cavity volume to aid in inhalation, primarily performed by the intercostal muscles.
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