Question
A trucking firm suspects that the mean life of a certain tire it uses is less...
A trucking firm suspects that the mean life of a certain tire it uses is less than the advertised 45,000 miles. To check the claim, the firm randomly selects and tests 22 of these tires and gets a mean lifetime of 44,350 miles with standard deviation of 1200 miles. a) The sample mean is 44,350. Before doing any work, what is gut feeling about the chances of the population mean being less than or equal to 45,000? Do you think that the sample mean of 44,350 is low enough and provides enough evidence? b) At α = 0.01, test the advertisement’s claim. c) Complete the hypothesis test and compare with your guess in part a.
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
A shipping firm suspects that the mean life of a certain brand of tire used by...
A shipping firm
suspects that the mean life of a certain brand of tire used by its
trucks is less than 39,000 miles. To check the claim, the firm
randomly selects and tests 18 of these tires and gets a mean
lifetime of 38,350 miles with a standard deviation of 1200 miles.
At α = 0.05, test the shipping firm's claim.
Find the test statistic, t. p value and null hypothesis Round to
four decimal places.
A company claims that the average lifespan of a bicycle tire that they manufacture is 1200...
A company claims that the average lifespan of a bicycle tire
that they manufacture is 1200 miles. You randomly and independently
collect a sample of 31 of these tires and find that the average
distance these tires lasted was 1125.7 miles, with a standard
deviation of 275 miles.
A 90% confidence interval for the population mean lifetime of
these tires is (1041.9, 1209.5).
Select all true statements.
Group of answer choices
The confidence interval indicates that the company's claim that...
1. A company claims that the average lifespan of a bicycle tire that they manufacture is...
1. A company claims that the average lifespan of a bicycle tire
that they manufacture is 1200 miles. You randomly and independently
collect a sample of 31 of these tires and find that the average
distance these tires lasted was 1125.7 miles, with a standard
deviation of 275 miles.
A 90% confidence interval for the population mean lifetime of
these tires is (1041.9, 1209.5).
Select all true statements.
a. The confidence interval indicates that the company's claim
that their tires...
A tire manufacturer claims that his tires have a mean life of 60,000 miles when used...
A tire manufacturer claims that his tires have a mean life of
60,000 miles when used under normal driving conditions. A firm that
requires a larger number of these tires wants to test the claim. If
the claim is correct, the firm will purchase the manufacturer’s
tires; otherwise, the firm will seek another supplier. Now a random
sample of 100 tires is taken and the mean and standard deviation of
the 100 tires are found. Using these sample results, a...
A tire manufacturer claims that his tires have a mean life of 60,000 miles when used...
A tire manufacturer claims that his tires have a mean life of
60,000 miles when used under normal driving conditions. A firm that
requires a larger number of these tires wants to test the claim. If
the claim is correct, the firm will purchase the manufacturer’s
tires; otherwise, the firm will seek another supplier. Now a random
sample of 100 tires is taken and the mean and standard deviation of
the 100 tires are found. Using these sample results, a...
A tire manufacturer claims that his tires have a mean life of 60,000 miles when used...
A tire manufacturer claims that his tires have a mean life of
60,000 miles when used under normal driving conditions. A firm that
requires a larger number of these tires wants to test the claim. If
the claim is correct, the firm will purchase the manufacturer’s
tires; otherwise, the firm will seek another supplier. Now a random
sample of 100 tires is taken and the mean and standard deviation of
the 100 tires are found. Using these sample results, a...
A tire manufacturer claims that his tires have a mean life of 60,000 miles when used...
A tire manufacturer claims that his tires have a mean life of
60,000 miles when used under normal driving conditions. A firm that
requires a larger number of these tires wants to test the claim. If
the claim is correct, the firm will purchase the manufacturer’s
tires; otherwise, the firm will seek another supplier. Now a random
sample of 100 tires is taken and the mean and standard deviation of
the 100 tires are found. Using these sample results, a...
Make sure to show all steps to receive full credit, that is: a) Identify the claim:...
Make sure to show all steps to receive full credit, that is: a)
Identify the claim: state the null and alternative hypotheses. b)
Determine the test: left-tailed, right-tailed, or two-tailed. c)
Graph your bell-shaped curve and label your levels of significance
or critical value. d) Find your standardized test statistic ? and
label it on your graph. e) Decide whether to reject or fail to
reject the null hypothesis. f) Interpret your result.
1) A dealership projected that the mean...
A particular brand of tires claims that its snow tire averages less than 50,000 miles before...
A particular brand of tires claims that its snow tire averages
less than 50,000 miles before it needs to be replaced. From past
studies of this tire, the standard deviation is known to be 8,000.
A survey of owners of that tire design is conducted. From the 28
tires surveyed, the mean lifespan was 46,500 miles with a standard
deviation of 9,800 miles. Using α = 0.05 to test the claim.
A tire manufacturer produces tires that have a mean life of at least 20000 miles when...
A tire manufacturer produces tires that have a mean life of at
least 20000 miles when the production process is working properly.
The operations manager stops the production process if there is
evidence that the mean tire life is below 20000 miles.
To monitor the production process, the operations manager takes
a random sample of 15 tires each week and subjects them to
destructive testing. They calculate the mean life of the tires in
the sample, and if it is...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 6 minutes ago
asked 9 minutes ago
asked 24 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 2 hours ago
asked 2 hours ago
asked 2 hours ago