Question

Congress regulates corporate fuel economy and sets an annual
gas mileage for cars. A company with a large fleet of cars hopes to
meet the 2011 goal of 30.2 mpg or better for their fleet of cars.
To see if the goal is being met, they check the gasoline usage for
50 company trips chosen at random from over 1000 trips, finding a
mean of 32.12 mpg and a standard deviation of 4.83 mpg. Is this
strong evidence that they have attained their fuel economy
goal?

a) Check the appropriate conditions to perform this test.
State each condition and state whether it has been satisfied or
not.

b) Regardless of your answers to part (a), test an appropriate
hypothesis and state your conclusion. Use a significance level of
0.05. (Use your calculator to conduct this test. Do not do the
calculations by hand.)

Answer #1

5. Congress regulates corporate fuel economy and sets an annual
gas mileage for cars. A company with a large fleet of cars hopes to
meet the 2011 goal of 30.2mpg or better for their fleet of cars. To
see if the goal is being met, they check the gasoline usage for 50
company trips chosen at random, finding a mean of 32.12mpg and a
standard deviation of 4.83mpg. In this strong evidence that they
have attained their fuel economy goal?...

A company with a large fleet of cars hopes to keep gasoline
costs down and sets a goal of attaining a fleet average of 27 mpg.
To see if the goal is being met, they check the gasoline usage of
50 company cars at random, finding a sample mean of 26.12 mpg and a
sample standard deviation of 4.83 mpg. We wish to determine if
there is strong evidence that they failed to attain their fuel
economy goal.
a) Write...

A company with a large effect of cars hopes to keep
gasoline costs down and sets a goal of attaining a fleet average of
at least 26 miles per gallon. To see if the goal is being met, they
check the gasoline usage for 50 company trips chosen at random,
finding a mean of 25.02 mpg and a standard deviation of 4.83 mpg.
Is this strong evidence that they have failed to attain their fuel
economy goal?Thecorrectnullandalternativehypotheses for testing the...

A company with a large fleet of cars hopes to keep gasoline
costs down and sets a goal of attaining an average gas mileage of
at least 29 mpg. To see if the goal is being met, they check the
gasoline usage for 54 company trips chosen at random, finding a
mean of 26.766 mpg and a standard deviation of 8.087 mpg. Does the
sample provide convincing evidence the mean gas mileage is less
than the goal set? Use a...

A company with a large fleet of cars hopes to keep gasoline
costs down and sets a goal of attaining a fleet average of at least
27 miles per gallon. To see if the goal is being met, they check
the gasoline usage for 70 company trips chosen at random, finding
a mean of 25.45 mpg and a standard deviation of 5.15 mpg. Is this
strong evidence they have failed to attain their fuel economy
goal?
Find the P-Value ____________...

A company with a large fleet of cars hopes to keep gasoline
costs down and sets a goal of attaining a fleet average of at least
25 miles per gallon. To see if the goal is being met, they check
the gasoline usage for 70 company trips chosen at random, finding
a mean of 24.37 mpg and a standard deviation of
4.38 mpg. Is this strong evidence they have failed to attain
their fuel economy goal?
Find the P-value.
The...

The Corporate Average Fuel Economy(CAFE) standards are
regulations first enacted by theU.S Congress... The Corporate
Average Fuel Economy(CAFE) standardsareregulations first enacted by
theU.S Congress in 1975 toimprove the averagefuel economy of cars
and light trucks (trucks, vans, and sport utility vehicles)
produced for sale in theU.S.These standards are costly because auto
manufacturers have to develop and install new technology to meet
these standards. But the benefits of fuel economy standards include
avoided damages from pollutants emitted when burning gasoline and...

The chief Financial Officer (CFO) for a company with a large
fleet of cars regularly used for company business is concerned
about gas consumption during the many trips for which these company
cars are used. In an effort to investigate the fuel efficiency of
the company fleet cars, the CFO randomly selects the fifty trips
for which company cars are used and the CFO determines that the gas
mileage for thee trips is, on average, 25.02 miles per gallon with...

Gasoline: Many drivers of cars that run on regular gas
actually buy premium in the belief that they will get better gas
mileage. To test that belief, we use 10 cars from a company fleet
in which all the cars run on regular gas. Each car is filled first
with either regular or premium gasoline, decided by a coin toss,
and the mileage for that tankful is recorded. Then the mileage is
recorded again for the same cars for...

For all hypothesis tests: Assume all samples are simple
random samples selected from normally distributed populations. If
testing means of two independent samples, assume variances are
unequal. For each test give the null and alternative hypothesis,
p-value, and conclusion as it relates to the claim.
In a random sample of 360 women, 65% favored stricter gun
control laws. In a random sample of 220 men, 60% favored stricter
gun control laws. Test the claim that the proportion of women
favoring...

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