Question

A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength...

A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B. The population standard deviation for thread A is 5.61 and for thread B is 6.28. A random sample of 50 pieces of each type of thread was tested under similar conditions. Type A thread had an average tensile strength of 86.9 kilograms and Type B thread had an average tensile strength of 84.8 kilograms. Test to determine if there if thread A is greater than thread B using a 0.05 level of significance.

The p-value is:

a.

0.0274
b.

0.0548
c.

0.0409
d.

0.0392
Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Let population 1: Type A thread

population 2: Type B thread

Hence, correct option is d.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength...
A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B by at least 12 kilograms. To test his claim, 50 pieces of each type of thread are tested under similar conditions. Type A thread had an average tensile strength of 86.7 kilograms with known standard deviation of σA = 6.28 kilograms, while type B thread had an average tensile strength of 77.8 kilograms with known standard deviation of σB = 5.61...
5. A manufacturer claims that the mean tensile strength of thread A exceeds the average tensile...
5. A manufacturer claims that the mean tensile strength of thread A exceeds the average tensile strength of thread B. To test his claim, 16 sample pieces of each type of thread are tested under similar conditions. Type A thread had a sample average tensile strength of 185 kilograms with a standard deviation of 6 kilograms, while type B thread had a sample average tensile strength of 178 kilograms with a standard of 9 kilograms. Assume that both populations are...
A generics manufacturer claims that the average tensile strength of its threadA is the same as...
A generics manufacturer claims that the average tensile strength of its threadA is the same as its name brand competitors thread B. To test this claim, 50 pieces of each type ofthread were tested under similar conditions. Type A thread had an average tensile strength of 42.7kilograms while type B thread had an average tensile strength of 43.9 kilograms. If the populationstandard deviations of thread A and thread B are 7.35 and 6.29 respectively, can you conclude up to aα=...
Two kinds of thread are being compared for strength. Fifty pieces of each type of thread...
Two kinds of thread are being compared for strength. Fifty pieces of each type of thread are tested under similar conditions. Brand A has an average tensile strength of 78.3 kilograms with a standard deviation of 5.6 kilograms, while brand B has an average tensile strength of 87.2 kilograms with a standard deviation of 6.3 kilograms. (a) We set significance at 4%, can we claim that there is difference the tensile strengths of the two brand? (justify your answer using...
A new type of thread is being tested for strength. 16 pieces of the thread are...
A new type of thread is being tested for strength. 16 pieces of the thread are tested. The sample is found to have an average tensile strength of 78.3 kg with a standard deviation of 8 kg. (a) Construct a 95% confidence interval for the tensile strength of the new thread. (b) What do you have to assume about the population and about the sample in order for this to be a valid confidence interval?
Two kinds of threads are been compared for strength. Fifty pieces of each type of thread...
Two kinds of threads are been compared for strength. Fifty pieces of each type of thread are tested under similar conditions. Brand A has an average tensile strength of 79.72 kg with a standard deviation of 5.14 KG while Brand B has an average tensile strength of 86.89 with a standard deviation of 5.63. Construct a 90% confidence interval for the ratio of two variances. answer should be written on word doc.
A manufacturer of air conditioners claims that their air conditioners will draw 0.8 amp on average...
A manufacturer of air conditioners claims that their air conditioners will draw 0.8 amp on average under normal conditions. A sample of 16 A/Cs was tested and the average current drawn was 0.98 amp with a standard deviation of 0.25 amp. Would you use Z test or t test? (In your answer, Type only Z or t)
The Tough Twine Company claims that their twine has an average breaking strength of 16.5 pounds....
The Tough Twine Company claims that their twine has an average breaking strength of 16.5 pounds. The head of the shipping department at Korber’s hardware store suspects that this figure is too high and wishes to test the appropriate hypothesis. He takes a random sample of 36 pieces and finds that the mean breaking strength of the sample is 15.8 lbs with s = 2.9 lbs. (a) State the null hypothesis and alternative hypothesis (b) Find the test statistic (c)...
A tire manufacturer claims that the average life of a certain grade of tire is 50,000...
A tire manufacturer claims that the average life of a certain grade of tire is 50,000 miles or more when used under normal driving conditions. A random sample of 20 tires is selected and tested and the sample mean is 49,650 miles. Assume the population of the lives is to be normal with standard deviation of 5,000 miles. At the 5% significance level, the manufacturer’s claim is tested. What is the decision rule in this test? Select one: A. Reject...
When is a hypothesis considered scientific? a. when it is based on something other than observation...
When is a hypothesis considered scientific? a. when it is based on something other than observation b. when it can be tested and is refutable c. when it relies on anecdotal evidence d. when it relies on mystical explanations e. All hypotheses are considered scientific until experiments determine otherwise. 3. Of the following, which is the earliest step in the scientific process? a. generating a hypothesis b. analyzing data c. conducting an experiment d. drawing a conclusion e. developing a...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT