A Fleet of Rental Cars - All the Same Make $\mu$

question 41

Multiple Choice

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of 24.7 miles per gallon (mpg) . A random sample of 54 cars are selected and the air filter of each is replaced with a new one. Let $\mu$ be the population mean fuel efficiency score that would occur if every car's air filter were replaced. The air filter change is deemed effective if $\mu > 24.7 \mathrm { mpg }$ . A test is made of $H _ { 0 } : \mu = 24.7$ versus $H _ { 1 } : \mu > 24.7$
Consider these possible conclusions:
i) . The air filter changes are effective.
ii) . The air filter changes are not effective.
iii) . The air filter changes might not be successful.
Which of the three conclusions is best if $H _ { 0 }$ is rejected?

• A) iii
• B) ii
• C) i

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Definitions:

Value Creation

Value creation is the process through which businesses generate value for customers, shareholders, and the community through innovative products, services, and operational efficiencies.

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The characteristics of paint including durability, finish, coverage, and color retention, determining its suitability for specific tasks and conditions.

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Measures work samples for compliance with quality standards. It is the term used to describe the set of statistical tools used by quality professionals.