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A car company is interested in testing to see whether the mean miles that a car engine will last without changing oil is the same or different depending on which brand of oil is used. The engineers also wish to control for the type of transmission (manual or automatic) that is used. To conduct this test, the car company obtains enough engines so that all four oil brands can be tested in a design that involves no replication. Based on this information, how many engines will be needed to conduct the test?
Intercostal Space
The anatomical area between two ribs, which contains muscles and nerves, playing a critical role in the mechanics of breathing.
Subcutaneous Emphysema
The presence of air or gas in the subcutaneous layer of the skin, often as a result of injury or surgery, causing swelling and a crackling sensation.
Serous Drainage
Clear, watery fluid that sometimes drains from wounds and is a normal part of the healing process.
Ventricular Fibrillation
A life-threatening heart rhythm that results in a rapid, erratic beat, leading to poor blood circulation.
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