A Fleet of Rental Cars - All the Same Make $24.1$

question 27

Multiple Choice

A fleet of rental cars - all the same make, model, and year - has a mean fuel efficiency of $24.1$ miles per gallon (mpg) . A random sample of 45 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 $\mu > 24.1 \mathrm { mpg }$ . A test is made of $H _ { 0 } : \mu = 24.1$ versus $H _ { 1 } : \mu > 24.1$ . 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) \(\mathrm { i }\)

Distinguish between positive and negative psychological approaches and their impacts on mental health.

Recognize the significance of mood, happiness, and emotional states in positive psychology.

Analyze the role of positive psychology in fostering well-being and mental health.

Examine the historical development and key contributors to the field of positive psychology.

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