The US government requires car manufacturers to keep the average fuel economy of

Question

The US government requires car manufacturers to keep the average fuel economy of the entire fleet of passenger cars sold above a certain standard (CAFE) or pay a fine. The actual CAFE standards are complex, but we will use the 2011 standard of 30.2 MPG highway as our target. We have a random sample of 50 MPG measurements from the entire fleet of cars made in the 2011 model year.   We'll take the point of view of the government agency which would like to show that the average MPG is less than 30.2 so that the company will have to pay a fine.

Question 1 (1 point)

What are the cases in this data set?

Question 1 options:

US Government

Cars

CAFE standards

Miles per gallon

Save

Question 2 (1 point)

Define the parameter of interest in words and notation.

Question 2 options

p=the true proportion of cars that have a MPG below 30.2

pˆ=the sample proportion of cars that have a MPG below 30.2

=the true mean MPG of the whole fleet of cars

x=the sample average MPG

Save

Question 3 (1 point)

The correct null and alternative hypotheses are:

Question 3 options:

H0: = 30.2, HA: = 29.76

H0: < 30.2, HA: > 30.2

H0: = 30.2, HA: < 30.2

H0: 30.2, HA: > 30.2

US Government

Cars

CAFE standards

Miles per gallon

Explanation / Answer

1) cases in this data set is CAFE standards

2) parameter of interest is =the true mean MPG of the whole fleet of cars

3)

H0: = 30.2, HA: < 30.2

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.