BUSINESS STATISTICS-2

Σε Εξέλιξη Αναρτήθηκε Πριν 7 χρόνια Πληρώθηκε κατά την παράδοση
Σε Εξέλιξη Πληρώθηκε κατά την παράδοση

1. As part of a safety check, the Pennsylvania Highway Patrol randomly stopped 25 cars and checked their tire pressure. The sample mean was 32 pounds per square inch with a sample standard deviation of 2 pounds per square inch. Develop a 98 percent confidence interval for the population mean.

2. A human resource manager for Carver County is evaluating a recent effort to improve the health of the county’s firefighters by providing an exercise room in each of the county’s firehouses. Their records prior to installing the exercise rooms indicate that the mean weight of all county firefighters is 198 pounds with a standard deviation of 13 pounds. A random sample of 40 firefighters taken six months after the program was implemented revealed that the mean of the sample was 192 pounds. Construct a 96% confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed. Assume that σ has not changed. Does it appear that the program is working?

3. The Department of Economic and Community Development (DECD) reported that in 2009 the average number of new jobs created per county was 450. The department also provided the following information regarding a sample of 5 counties in 2010.

County New Jobs Created In 2010

Bradley 410

Rhea 480

Marion 407

Grundy 428

Sequatchie 400

a. Compute the sample average and the standard deviation for 2010.

b. We want to determine whether there has been a significant decrease in the average number of jobs created. Provide the null and the alternative hypotheses.

c. Use the testing of hypothesis for your conclusion.

4. A producer of various kinds of batteries has been producing "D" size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in the life expectancy of their "D" size batteries. A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 9 hours.

a. Give the null and the alternative hypotheses.

b. Compute the test statistic.

c. At 99% confidence using the critical value approach, test management's belief.

d. What is your conclusion based on testing of hypothesis?

Λογιστικά Οικονομικά

Ταυτότητα Εργασίας: #10321466

Σχετικά με την εργασία

6 προτάσεις Απομακρυσμένη εργασία Ενεργό Πριν 7 χρόνια

Ανατέθηκε στον:

donissac1

This is a requirement for statistics, for which I have studied and use in my daily work. I can easily complete the problems for you as well as give you detailed explanations which you can use for submission.

$35 USD σε 1 μέρα
(0 Αξιολογήσεις)
0.0

6 freelancers κάνουν προσφορές κατά μέσο όρο $98 για αυτή τη δουλειά

NoelReubenMuturi

In case the project is deleted, contact me via this link https://www.freelancer.com/u/NoelReubenMuturi.html Hallo, I am Noel, an experienced freelance writer in diverse fields. I am well-acquainted with academic Περισσότερα

$94 USD σε 3 μέρες
(261 Αξιολογήσεις)
7.7
rakeshwadhwani

Dear Valued Employer, I can add value to your project, by suggesting new ideas. I am fast and reliable. For further understanding why I am the right firm for your project, kindly check my profile, reviews, rating and Περισσότερα

$250 USD σε 1 μέρα
(70 Αξιολογήσεις)
6.5
sdk2788

Greetings! How are you doing today? Great to see your project! I would love to work with you on this project! My highest ratings and reviews (more than 1975; My Profile Link: https://www.freelancer.com/u/sdk2788.html) Περισσότερα

$90 USD σε 2 μέρες
(78 Αξιολογήσεις)
6.7
hemantjhalani

I have done master's in statistics and mathematics with excellent analytic skills. So I am one of the suitable candidate for this project. free to contact me . thanks in advance

$90 USD σε 1 μέρα
(2 Αξιολογήσεις)
3.1