A manager wants to compare the mean time required to build a product using two different...
A manager wants to compare the mean time required to build a product using two different assembly methods, A and B. The time per unit was recorded for independent random samples from each method. The results are below. Assuming that the variances for the two populations are equal, use this data to form a 99% confidence interval for the true difference (μA−μB)(μA−μB) between the mean times for the two methods.
Do not round intermediate calculations. Enter your final answers as decimals rounded to two decimal places. Enter a "−" sign immediately before a negative answer.
Lower confidence limit = , Upper confidence limit =
| Sample Size | Mean Time | Sample Standard Deviation | ||||
| Method A | 33 | units | 5.47 | minutes | 0.55 | minutes |
| Method B | 34 | units | 5.12 | minutes | 0.48 | minutes |
Homework Answers
Add Answer to:
A manager wants to compare the mean time required to build a
product using two different...
A clinical psychologist wished to compare three methods for reducing hostility levels in university students using...
A clinical psychologist wished to compare three methods for reducing hostility levels in university students using a certain psychological test (HLT). High scores on this test were taken to indicate great hostility, and 11 students who got high and nearly equal scores were used in the experiment. Five were selected at random from among the 11 students and treated by method A, three were taken at random from the remaining six students and treated by method B, and the other...
A clinical psychologist wished to compare three methods for reducing hostility levels in university students using...
A clinical psychologist wished to compare three methods for reducing hostility levels in university students using a certain psychological test (HLT). High scores on this test were taken to indicate great hostility, and 11 students who got high and nearly equal scores were used in the experiment. Five were selected at random from among the 11 students and treated by method A, three were taken at random from the remaining six students and treated by method B, and the other...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs,...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 11 bulbs of model A showed a mean lifetime of 1345 hours and a standard deviation of 102 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1389 hours and a standard deviation of 82 hours. Assume that the populations of lifetimes for each...
please answer neatly and correctly! light bulb manufacturer wants to compare the mean lifetimes of two...
please answer neatly and correctly!
light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 9 bulbs of model A showed a mean lifetime of 1234 hours and a standard deviation of 81 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1391 hours and a standard deviation of 110 hours. Assume that the populations...
Please answer neatly and correctly! A light bulb manufacturer wants to compare the mean lifetimes of...
Please answer neatly and correctly!
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 15 bulbs of model A showed a mean lifetime of 1350 hours and a standard deviation of 102 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1384 hours and a standard deviation of 91 hours. Assume that the...
answer neatly and correctly please! The university data center has two main computers. The center wants...
answer neatly and correctly
please!
The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2. A random sample of 12 processing times from computer 1 showed a mean of 62 seconds with a standard deviation of 17 seconds, while a random sample of 9 processing times from computer 2 (chosen independently of those for computer 1) showed a mean of 66...
The university data center has two main computers. The center wants to examine whether computer 1...
The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2. A random sample of 9 processing times from computer I showed a mean of 52 seconds with a standard deviation of 19 seconds, while a random sample of 14 processing times from computer 2 (chosen independently of those for computer 1) showed a mean of 56 seconds with a standard deviation...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the...
When is unknown and the sample is of size n 230, there are two methods for...
When is unknown and the sample is of size n 230, there are two methods for computing confidence intervals for u. (Notice that, When is unknown and the sample is of size n<30, there is only one method for constructing a confidence interval for the mean by using the student's t distribution with d.f. = n - 1.) Method 1: Use the Student's t distribution with d.f. = n - 1. This is the method used in the text. It...
Suppose that the training director of a manufacturing company wanted to compare three different team-based approaches...
Suppose that the training director of a manufacturing company wanted to compare three different team-based approaches (A, B, C). Each member of a group of 26 new employees was randomly assigned to one of three team-based methods. After completing training, the employees in the study were evaluated on the time it took (in minutes) to assemble the product. The results are summarized as follows Time To Assemble Product Methods B A C 8.82 8.21 8.57 9.26 6.65 8.50 8.70 7.44...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 11 bulbs of model A showed a mean lifetime of 1345 hours and a standard deviation of 102 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1389 hours and a standard deviation of 82 hours. Assume that the populations of lifetimes for each...
please answer neatly and correctly!
light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 9 bulbs of model A showed a mean lifetime of 1234 hours and a standard deviation of 81 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1391 hours and a standard deviation of 110 hours. Assume that the populations...
Please answer neatly and correctly!
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 15 bulbs of model A showed a mean lifetime of 1350 hours and a standard deviation of 102 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1384 hours and a standard deviation of 91 hours. Assume that the...
answer neatly and correctly
please!
The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2. A random sample of 12 processing times from computer 1 showed a mean of 62 seconds with a standard deviation of 17 seconds, while a random sample of 9 processing times from computer 2 (chosen independently of those for computer 1) showed a mean of 66...
The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2. A random sample of 9 processing times from computer I showed a mean of 52 seconds with a standard deviation of 19 seconds, while a random sample of 14 processing times from computer 2 (chosen independently of those for computer 1) showed a mean of 56 seconds with a standard deviation...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the...
When is unknown and the sample is of size n 230, there are two methods for computing confidence intervals for u. (Notice that, When is unknown and the sample is of size n<30, there is only one method for constructing a confidence interval for the mean by using the student's t distribution with d.f. = n - 1.) Method 1: Use the Student's t distribution with d.f. = n - 1. This is the method used in the text. It...
Suppose that the training director of a manufacturing company wanted to compare three different team-based approaches (A, B, C). Each member of a group of 26 new employees was randomly assigned to one of three team-based methods. After completing training, the employees in the study were evaluated on the time it took (in minutes) to assemble the product. The results are summarized as follows Time To Assemble Product Methods B A C 8.82 8.21 8.57 9.26 6.65 8.50 8.70 7.44...
Most questions answered within 3 hours.
-
Calculate the specific heat of a certain unknown metal, if it
requires 195 joules of heat...
asked 4 minutes ago -
Identify the characteristics of a successful
project.
Describe the phases the project lifecycle.
Define the roles...
asked 13 minutes ago -
1. In Module 2 "headers" and "footers" are
described. Explain the difference between them and how...
asked 8 minutes ago -
Three polarizing filters are stacked with the polarizing axes of
the second and third at 58.5...
asked 17 minutes ago -
The capacitance in a series RCL circuit is C1 = 3.3 μF, and
the corresponding resonant...
asked 27 minutes ago -
A 357.7-gram sample of an unknown substance (MM = 92.41 g/mol)
is heated from -23.1 °C...
asked 26 minutes ago -
The project aims to design a network for a casino. The casino
has 10 floors including...
asked 31 minutes ago -
Combustion of an unknown compound containing only carbon and
hydrogen produces 54.9 g of CO₂ and...
asked 46 minutes ago -
A basketball player achieves a hang time, the total time of
flight, of 0.748 s when...
asked 47 minutes ago -
A processor of carrots cuts the green top off each carrot,
washes the carrots, and inserts...
asked 59 minutes ago -
Please help me find the coefficient of kinetic and static
friction of two masses (500kg and...
asked 55 minutes ago -
Stanley Department Stores reported net income of $815,000 for
the year ended December 31, 2018.
Additional...
asked 1 hour ago