The manufacturer of cell phone batteries wants to estimate the useful life of the battery (in...
|
The manufacturer of cell phone batteries wants to estimate the useful life of the battery (in thousands of hours). The estimate is to be within .15 (150) hours. Assume a 95 percent level of confidence and that the standard deviation of the useful life of the battery is 2.00 (2,000) hours. |
|
Determine the required sample size. (Round your answer to the next whole number.) |
| Sample size |
Homework Answers
Add Answer to:
The manufacturer of cell phone batteries wants to estimate the
useful life of the battery (in...
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation...
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 17 AAA batteries produced by this manufacturer lasted a mean of 11 hours with a standard deviation of 2.5 hours. Find a 95% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below.Carry your intermediate computations to at least...
a) Battery life for a hand-held computer is normally distrbuted and has a population standard deviation...
a) Battery life for a hand-held computer is normally distrbuted and has a population standard deviation of 3 hours. Suppose you need to estimate a confidence interval estimate at the 95% level of confidence for the mean life of these batteries. Determine the sample size required to have a margin of error of 0.253 hours. Round up to the nearest whole number. b)The managers of a company are worried about the morale of their employees. In order to determine if...
Please do all questions... A cell phone battery manufacturer claims that one of their batteries for...
Please do all questions...
A cell phone battery manufacturer claims that one of their batteries for a particular cell phone will outperform a competitor's equivalent brand. To establish this claim, a researcher selected samples of the two brands of batteries and perform accelerated tests on them in the lab under identical conditions. A random sample of 55 of the manufacturer's battery was selected and placed on test. A corresponding random sample of 55 of the competitor's battery was also put...
2 3 5 Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate...
2 3 5 Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 15 AAA batteries produced by this manufacturer lasted a mean of 10.5 hours with a standard deviation of 2.4 hours. Find a 90% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below. Carry your intermediate...
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the leading product has a less than desirable battery life. They aim to compete with a new touch screen phone that is guaranteed to have a battery life mor
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the leading product has a less than desirable battery life. They aim to compete with a new touch screen phone that is guaranteed to have a battery life more than two hours longer than the leading product. A recent sample of 120 units of the leading product provides a mean battery life of 5 hours and 40 minutes with a standard deviation of 30 minutes. A...
A phone manufacturer wants to compete in the touch screen phone market. He understands that the...
A phone manufacturer wants to compete in the touch screen phone market. He understands that the lead product has a battery life of just 5 hours. The manufacturer claims that while the new touch screen phone is more expensive, its battery life is more than twice as long as that of the leading product. In order to test the claim, a researcher samples 45 units of the new phone and finds that the sample battery life averages 10.5 hours with...
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the...
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the leading product has a less than desirable battery life. They aim to compete with a new touch screen phone that is guaranteed to have a battery life more than two hours longer than the leading product. A recent sample of 147 units of the leading product provides a mean battery life of 5 hours and 52 minutes with a standard deviation of 38 minutes....
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the...
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the leading product has a less than desirable battery life. They aim to compete with a new touch screen phone that is guaranteed to have a battery life more than two hours longer than the leading product. A recent sample of 101 units of the leading product provides a mean battery life of 6 hours and 22 minutes with a standard deviation of 46 minutes....
As batteries discharge, their voltage decreases. The manufacturer of a cell phone battery would like to...
As batteries discharge, their voltage decreases. The manufacturer of a cell phone battery would like to maintain 90.0% of its initial voltage. If a battery has an initial voltage of 5.95 V and loses an average of 0.040 V per minute, how long will it remain at 90.0% or more of the initial voltage? In minutes
A manufacturer of batteries periodically selects samples of batteries. A recent sample of batteries powered a...
A manufacturer of batteries periodically selects samples of batteries. A recent sample of batteries powered a common flashlight for 212, 324, 299, 265, 199, 352, 381, and 392 hours. The standard deviation of the hours of battery life in this sample is
Please do all questions...
A cell phone battery manufacturer claims that one of their batteries for a particular cell phone will outperform a competitor's equivalent brand. To establish this claim, a researcher selected samples of the two brands of batteries and perform accelerated tests on them in the lab under identical conditions. A random sample of 55 of the manufacturer's battery was selected and placed on test. A corresponding random sample of 55 of the competitor's battery was also put...
2 3 5 Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 15 AAA batteries produced by this manufacturer lasted a mean of 10.5 hours with a standard deviation of 2.4 hours. Find a 90% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below. Carry your intermediate...
A phone manufacturer wants to compete in the touch screen phone market. He understands that the lead product has a battery life of just 5 hours. The manufacturer claims that while the new touch screen phone is more expensive, its battery life is more than twice as long as that of the leading product. In order to test the claim, a researcher samples 45 units of the new phone and finds that the sample battery life averages 10.5 hours with...
A phone manufacturer wants to compete in the touch screen phone market. Management understands that the leading product has a less than desirable battery life. They aim to compete with a new touch screen phone that is guaranteed to have a battery life more than two hours longer than the leading product. A recent sample of 101 units of the leading product provides a mean battery life of 6 hours and 22 minutes with a standard deviation of 46 minutes....
Most questions answered within 3 hours.
-
You plan to save $5,700 per year for the next 10 years. After
the last deposit,...
asked 19 minutes ago -
On January 1, 2019, ABC Corp. borrowed $81,000 by signing an
installment loan. The loan will be...
asked 23 minutes ago -
Enzyme X exhibits maximum activity at pH = 5.25. X shows a sharp
decrease in its...
asked 38 minutes ago -
Postulate a reason for why so many aliphatic amino acids are
essential.
asked 37 minutes ago -
Three samples were taken of 4 different dog food bags and their
weights were recorded:
Sample/Observation...
asked 41 minutes ago -
The Beatles had 27 number one hits; a radio station asks
listeners to send in a...
asked 38 minutes ago -
Help with Java Program Please
Create a simple graph class. The graph class should have the...
asked 39 minutes ago -
Which of the following statements is true regarding the nature
of culture?
A.We are born with...
asked 1 hour ago -
(a) 2
NO2(g) à 2
NO(g) +
O2(g)
The rate law for this reaction
is 2nd...
asked 1 hour ago -
Write the overall reaction for the RedOx
reaction (below) when it occurs in an acidic environment....
asked 1 hour ago -
Two forces are acting on an object. Force 1 on the object is 6.0
N and...
asked 1 hour ago -
You are planning for retirement. You plan to work for 20 years.
Starting a year from...
asked 1 hour ago