Question

A battery manufacturer advertises that the mean reserve capacity of a certain battery is 1500 hours....

A battery manufacturer advertises that the mean reserve capacity of a certain battery is 1500 hours. You suspect that the batteries’ reserve time is less than the advertised value. To test this claim, you randomly select a sample of 20 batteries and find the mean reserve capacity to be 1320 hours. Assume that the population standard deviation is 320 hours. Do you have enough evidence to support the manufacturer’s claim? What assumption is necessary for this test to be valid?

A. None. The Central Limit Theorem makes any assumptions unnecessary.

B. The population of all the batteries’ reserve time is normally distributed because of the small sample size.

C. The population variance must equal the population mean.

Homework Answers

Answer #1

Ans :

B. The population of all the batteries’ reserve time is normally distributed because of the small sample size.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A manufacturer claims that the mean life time of its lithium batteries is 1500 hours ....
A manufacturer claims that the mean life time of its lithium batteries is 1500 hours . A home owner selects 30 of these batteries and finds the mean lifetime to be 1470 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use=0.05. Round the test statistic to the nearest thousandth. a) Hypothesis: b)Critical value (t critical): c)Test statistic (tstat) and the decision about the test statistic:(reject or fail to reject Ho): d)Conclusion that results from the decision...
Employees in a large accounting firm claim that the mean salary of the firm’s accountants is...
Employees in a large accounting firm claim that the mean salary of the firm’s accountants is less than that of its competitor’s which is $45,000. A random sample of 16 of the firm’s accountants has a mean salary of $43,500. Assume that the population standard deviation is $5200. Test the employees claim. What assumption is necessary for this test to be valid? None. The Central Limit Theorem makes any assumptions unnecessary. The population of all salaries of the firm’s accountants...
A manufacturer claims that the mean lifetime of its lithium batteries is less than 1500 hours....
A manufacturer claims that the mean lifetime of its lithium batteries is less than 1500 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 1480 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use α = 0.10. A. P-value = 0.112 > 0.10; do not reject H0; There is not enough evidence support the claim, that mean is less than 1500. B. P-value = 0.112 > 0.05; do not reject...
1. A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A...
1. A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufacturer's claim. Use alpha equal to 0.05. State the sample mean and the population standard deviation. 2. Using problem in number 1. Choose the correct hypotheses. 3. Using the problem in number 1. State the critical value(s). 4. Using the problem...
A company claims that the mean battery life of their MP3 players at least 30 hours....
A company claims that the mean battery life of their MP3 players at least 30 hours. You suspect this claim is incorrect and find that a random sample of 18 MP3 players has a mean battery life of 28.5 hours and a standard deviation of 1.7 ours. Is there enough evidence to reject the claim at α=0.01? Find the standardized test statistics t Decide whether to reject or fail to reject the null hypothesis
A company claims that the mean battery life of their MP3 player is = 30 hours....
A company claims that the mean battery life of their MP3 player is = 30 hours. You suspect this claim is incorrect and find a random sample of 18 MP3 players has a mean battery life of 28.5 hours and a standard deviation of 7 hours. Is there enough evidence to reject the null hypothesis a=0.01?         Ho: u=30 Ha: not = 30.
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner...
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1490 hours with a population standard deviation of 80 hours. Test the manufacturers claim. Use a=0.05. Show graph as well.
1. The life in hours of a battery is normally distributed with σ = 1.25 hours....
1. The life in hours of a battery is normally distributed with σ = 1.25 hours. A random sample of 10 batteries has a mean life of 40.6 hours. Is there evidence to support the claim that battery life exceeds 40 hours? Use α = 0.05. You may use the traditional or P-value method. 2. Repeat exercise #1 if we do not know σ, but estimate the population S.D. using s = 1. Use the traditional method.
40. A cell phone manufacturer claims that its phone will last for more than 8 hours...
40. A cell phone manufacturer claims that its phone will last for more than 8 hours of continuous talk time when the battery is fully charged. To test this claim at a​ 10% level of​ significance, a random sample of 18 phones were selected. The results showed a sample mean of 8.2 hours and a sample standard deviation of 0.4 hour. Based on the data and hypothesis​ test, can you dispute the cell phone​ manufacturer’s claim? A. YES B. NO...
A certain type of battery is said to last for 2000hours. A sample of 200 of...
A certain type of battery is said to last for 2000hours. A sample of 200 of these batteries were tested; the mean life was 1995 hours and the standard deviation of the lives was 25.5 hours. Use these data to test the hypothesis that the population mean life is 2000 hours against the alternative that it is less than 2000 hours. State the level of significance you are using in your test.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT