A Hypothesis Test Is to Be Performed $< 23 \mathrm { mpg }$

question 127

Multiple Choice

A hypothesis test is to be performed. State the null and alternative hypotheses.
-Carter Motor Company claims that its new sedan, the Libra, will average better than 25 miles per gallon, which is the gas mileage of its competitor.

• A) Null hypothesis: mean gas mileage \(< 23 \mathrm { mpg }\)
• Alternative hypothesis: mean gas mileage \(> 23 \mathrm { mpg }\)
• B) Null hypothesis: mean gas mileage \(> 23 \mathrm { mpg }\)
• Alternative hypothesis: mean gas mileage \(= 23 \mathrm { mpg }\)
• C) Null hypothesis: mean gas mileage \(= 23 \mathrm { mpg }\)
• Alternative hypothesis: mean gas mileage \(\geq 23 \mathrm { mpg }\)
• D) Null hypothesis: mean gas mileage \(= 23 \mathrm { mpg }\)
• Alternative hypothesis: mean gas mileage \(> 23 \mathrm { mpg }\)

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Definitions:

Ciliated

Ciliated refers to cells that have fine hair-like structures called cilia on their surface, which are involved in movement or the transport of materials over the cell surface.

Secondary Bronchus

Branches of the bronchi that lead air into each lobe of the lungs for gas exchange; these are subdivisions of the primary bronchi.

Tertiary Bronchus

The tertiary bronchus, also known as the segmental bronchus, branches off the secondary bronchus in the lung and serves specific lung segments.

Bronchiole

One of the finer subdivisions of the bronchial tubes, less than 1 mm in diameter; has no cartilage in its wall but does have relatively more smooth muscle and elastic fibers.